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What Were the Top Causes of the Civil War?

• M.A., History, University of Florida
• B.A., History, University of Florida

The question “What caused the U.S. Civil War?” has been debated since the horrific conflict ended in 1865. As with most wars, however, there was no single cause.

The Civil War erupted from a variety of longstanding tensions and disagreements about American life and politics. For nearly a century, the people and politicians of the Northern and Southern states had been clashing over the issues that finally led to war: economic interests, cultural values, the power of the federal government to control the states, and, most importantly, slavery in American society.

While some of these differences might have been resolved peacefully through diplomacy, the institution of slavery was not among them. With a way of life steeped in age-old traditions of white supremacy and a mainly agricultural economy that depended on the labor of enslaved people, the Southern states viewed enslavement as essential to their very survival.

Slavery in the Economy and Society

At the time of the Declaration of Independence in 1776, the enslavement of people not only remained legal in all 13 British American colonies, but it also continued to play a significant role in their economies and societies.

Before the American Revolution, the institution of slavery in America had become firmly established as being limited to persons of African ancestry. In this atmosphere, the seeds of white supremacy were sown.

Even when the U.S. Constitution was ratified in 1789, very few Black people and no enslaved people were allowed to vote or own property.

However, a growing movement to abolish slavery had led many Northern states to enact abolitionist laws and abandon enslavement. With an economy based more on industry than agriculture, the North enjoyed a steady flow of European immigrants. As impoverished refugees from the potato famine of the 1840s and 1850s, many of these new immigrants could be hired as factory workers at low wages, thus reducing the need for enslaved people in the North.

How Slavery Spread Through the South

In the Southern states, longer growing seasons and fertile soils had established an economy based on agriculture fueled by sprawling plantations owned by White people that depended on enslaved people to perform a wide range of duties.

When Eli Whitney invented the cotton gin in 1793, cotton became very profitable. This machine was able to reduce the time it took to separate seeds from the cotton. At the same time, the increase in the number of plantations willing to move from other crops to cotton created an even greater need for enslaved people. The Southern economy became a one-crop economy, depending on cotton and, therefore, on enslaved people.

Though it was often supported throughout the social and economic classes, not every White Southerner enslaved people. The population of the pro-slavery states was around 9.6 million in 1850 and only about 350,000 were enslavers. This included many of the wealthiest families, several of whom owned large plantations. At the start of the Civil War , at least 4 million enslaved people were forced to live and work on the Southern plantations.

Conflict Between the North and the South

In contrast, industry ruled the economy of the North and less emphasis was on agriculture, though even that was more diverse. Many Northern industries were purchasing the South's raw cotton and turning it into finished goods.

This economic disparity also led to irreconcilable differences in societal and political views.

In the North, the influx of immigrants—many from countries that had long since abolished slavery—contributed to a society in which people of different cultures and classes lived and worked together.

The South, however, continued to hold onto a social order based on white supremacy in both private and political life, not unlike that under the rule of racial apartheid that persisted in South Africa for decades .

In both the North and South, these differences influenced views on the powers of the federal government to control the economies and cultures of the states.

States and Federal Rights

Since the time of the American Revolution , two camps emerged when it came to the role of government. Some people argued for greater rights for the states and others argued the federal government needed to have more control.

The first organized government in the U.S. after the Revolution was under the Articles of Confederation. The 13 states formed a loose Confederation with a very weak federal government. However, when problems arose, the weaknesses of the Articles caused the leaders of the time to come together at the Constitutional Convention and create, in secret, the U.S. Constitution .

Strong proponents of states' rights like Thomas Jefferson and Patrick Henry were not present at this meeting. Many felt that the new Constitution ignored the rights of states to continue to act independently. They felt that the states should still have the right to decide if they were willing to accept certain federal acts.

This resulted in the idea of nullification , whereby the states would have the right to rule federal acts unconstitutional. The federal government denied states this right. However, proponents such as John C. Calhoun —who resigned as vice president to represent South Carolina in the Senate—fought vehemently for nullification. When nullification would not work and many of the Southern states felt that they were no longer respected, they moved toward thoughts of secession.

Pro-Slavery States and Free States

As America began to expand—first with the lands gained from the Louisiana Purchase and later with the Mexican War —the question arose of whether new states would be pro-slavery states or free states. An attempt was made to ensure that equal numbers of free states and pro-slavery states were admitted to the Union, but over time this proved difficult.

The Missouri Compromise passed in 1820. This established a rule that prohibited enslavement in states from the former Louisiana Purchase north of the latitude 36 degrees 30 minutes, except for Missouri.

During the Mexican War, the debate began about what would happen with the new territories the U.S. expected to gain upon victory. David Wilmot proposed the Wilmot Proviso in 1846, which would ban enslavement in the new lands. This was shot down amid much debate.

The Compromise of 1850 was created by Henry Clay and others to deal with the balance between pro-slavery states and free states. It was designed to protect both Northern and Southern interests. When California was admitted as a free state, one of the provisions was the Fugitive Slave Act . This held individuals responsible for harboring freedom-seeking enslaved people, even if they were located in free states.

Tensions Around Slavery Rise

The  Kansas-Nebraska Act of 1854 was another issue that further increased tensions. It created two new territories that would allow the states to use popular sovereignty to determine whether they would be free states or pro-slavery states. The real issue occurred in Kansas where pro-slavery Missourians, called "Border Ruffians," began to pour into the state in an attempt to force it toward slavery.

Problems came to a head with a violent clash at Lawrence, Kansas. This caused it to become known as " Bleeding Kansas ." The fight even erupted on the floor of the Senate when anti-slavery proponent Sen. Charles Sumner of Massachusetts was beaten on the head by South Carolina Sen. Preston Brooks.

The Abolitionist Movement

Increasingly, Northerners became more polarized against enslavement. Sympathies began to grow for abolitionists and against enslavement and enslavers. Many in the North came to view enslavement as not just socially unjust, but morally wrong.

The abolitionists came with a variety of viewpoints. People such as William Lloyd Garrison and Frederick Douglass wanted immediate freedom for all enslaved people. A group that included Theodore Weld and Arthur Tappan advocated for emancipating enslaved people slowly. Still others, including Abraham Lincoln, simply hoped to keep slavery from expanding.

Many events helped fuel the cause for abolition in the 1850s.  Harriet Beecher Stowe  wrote " Uncle Tom's Cabin ," a popular novel that opened many eyes to the reality of enslavement. The Dred Scott Case  brought the issues of enslaved peoples' rights, freedom, and citizenship to the Supreme Court.

Additionally, some abolitionists took a less peaceful route to fighting against slavery. John Brown and his family fought on the anti-slavery side of "Bleeding Kansas." They were responsible for the Pottawatomie Massacre, in which they killed five settlers who were pro-slavery. Yet, Brown's best-known fight would be his last when the group attacked Harper's Ferry in 1859, a crime for which he would hang.

The Election of Abraham Lincoln

The politics of the day were as stormy as the anti-slavery campaigns. All of the issues of the young nation were dividing the political parties and reshaping the established two-party system of Whigs and Democrats.

The Democratic Party was divided between factions in the North and South. At the same time, the conflicts surrounding Kansas and the Compromise of 1850 transformed the Whig Party into the Republican Party (established in 1854). In the North, this new party was seen as both anti-slavery and for the advancement of the American economy. This included the support of industry and encouraging homesteading while advancing educational opportunities. In the South, Republicans were seen as little more than divisive.

The presidential election of 1860 would be the deciding point for the Union. Abraham Lincoln represented the new Republican Party and Stephen Douglas , the Northern Democrat, was seen as his biggest rival. The Southern Democrats put John C. Breckenridge on the ballot. John C. Bell represented the Constitutional Union Party, a group of conservative Whigs hoping to avoid secession.

The country's divisions were clear on Election Day. Lincoln won the North, Breckenridge the South, and Bell the border states. Douglas won only Missouri and a portion of New Jersey. It was enough for Lincoln to win the popular vote, as well as 180 electoral votes .

Even though things were already near a boiling point after Lincoln was elected, South Carolina issued its "Declaration of the Causes of Secession " on December 24, 1860. They believed that Lincoln was anti-slavery and in favor of Northern interests.

Southern States Begin Seceding From the Union

President James Buchanan's administration did little to quell the tension or stop what would become known as " Secession Winter ." Between Election Day and Lincoln's inauguration in March, seven states seceded from the Union: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas.

In the process, the South took control of federal installations, including forts in the region, which would give them a foundation for war. One of the most shocking events occurred when one-quarter of the nation's army surrendered in Texas under the command of General David E. Twigg. Not a single shot was fired in that exchange, but the stage was set for the bloodiest war in American history.

Causes of the Civil War

• The U.S. Civil War stemmed from a complex web of tensions over economic interests, cultural values, federal government power, and most significantly, the institution of slavery.
• While the North and South clashed over these issues for decades, the Southern states, rooted in white supremacy and reliant on enslaved labor for their agricultural economy, viewed enslavement as indispensable to their way of life—thus setting the stage for conflict.
• The election of Abraham Lincoln in 1860, representing the anti-slavery Republican Party, triggered Southern states' secession from the Union, marking a point of no return and leading to the outbreak of the bloodiest war in American history.

DeBow, J.D.B. "Part II: Population." Statistical View of the United States, Compendium of the Seventh Census . Washington: Beverley Tucker, 1854. 

De Bow, J.D.B. " Statistical view of the United States in 1850 ." Washington: A.O.P. Nicholson. 

Kennedy, Joseph C.G. Population of the United States 1860: Compiled from the Original Returns of the 8th Census . Washington DC: Government Printing Office, 1864.

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The Causes of the American Civil War

Introduction.

The Civil War (1861-1865) was one of the most significant events in American history that paved the way for future generations to live in ways that were unimaginable a few years later. It preserved the unity of the nation, gave a much-needed boost to the American economy, and turned the country into the land of opportunity that it remains to this day. The positive outcomes came at a high price: the Civil War is by far the deadliest war that has ever been fought on American soil. It is now estimated that some 620,000 of 2.4 million soldiers lost their lives, millions more were injured, and much of the South was left in debris (Woodworth & Higham 1996). Still, decades after the Civil War ended, its causes and origins still generate controversies among historians. This essay argues that it was the political control, states’ rights, and economics that revolving around the issue of slavery that caused the Civil War.

The Causes of the Civil War

The great economic divide.

The outbreak of the Civil War in 1861 was far from sudden or surprising: in fact, it was the logical result of the decades of simmering tension between the North and the South. The issue that led to the disruption of the Union was slavery – an exploitative institution dating back to the 15th century when the Transatlantic slave trade began. Fast forward to the mid-19th century, the United States was experiencing fast-paced economic growth as a whole, though with a growing divide in the economic capacity between the country’s Northern and Southern regions (Woodworth & Higham 1996). The North enjoyed well-established manufacturing and industry while its agriculture was primarily confined to small-scale farms.

In contrast, the South’s economy relied on large-scale farming sustained by the labor of African slaves that were growing certain crops with an emphasis on cotton and tobacco. By the year 1860, despite housing a fourth of the country’s free population, the South only had 10% of the country’s capital (Woodworth & Higham 1996). Other figures from back then are as convincing: after the Industrial Revolution, the North had five times more factories than the South (Woodworth & Higham 1996). Besides, nine out of ten skilled workers in the US resided in the North (Woodworth & Higham 1996). Since they were not enslaved, they could freely refine their skills, choose a workplace of their liking, and propel the economic growth.

The Start of the Abolitionist Movement

As early as the 1830s, the Union saw the emergence and development of the anti-slavery abolitionist movement in the North. It was probably triggered by the so-called Missouri compromise when in 1820, amidst growing tensions, the US Congress proclaimed Missouri as a slave state and Maine as a free state (Shi & Tindall, 2016). The majority of early abolitionists were religious, White people – they appealed to religion when making their argument and saw slavery as an abomination (Duberman, 2015). Soon, the movement was joined by Black men and women who escaped captivity. Together, abolitionists became an active group that was sending petitions to Congress, ran candidates for political office, and popularized anti-slavery literature in the South. In summation, by opposing slavery’s extension into the new territories and criticizing the entire institution, abolitionists were endangering the backbone of the Southern economy.

Kansas-Nebraska Act of 1854

Proposed by Abraham Lincoln’s main opponent, Stephen A. Douglas, The Kansas-Nebraska Act of 1854 defeated the progress made by the Abolitionist movement. The new bill mandated “popular sovereignty”: essentially, settlers of a territory now had the right to decide whether slavery will be legal within a new state’s borders (Shi & Tindall, 2016). The Act repealed the Missouri Compromise of 1820 that made slavery in the territories north of latitude 36°30´ illegal. It further aggravated the tension between the North and the South. The North considered the 1820 Missouri compromise an imperfect but mutually beneficial agreement. The South, on the other hand, was overwhelmingly in support of the Kansas-Nebraska Act because the issue of slavery now could be handled locally.

It was clear that the election in Kansas would settle the first important precedent after the law went into effect. For this reason, both supporters and opponents of slavery hastily moved to Kansas to tip the outcome of the first election. At first, it was pro-slavery settlers who led the elections; however, the results were found to be fraudulent by anti-slavery settlers that refused to accept them. Soon, the anti-slavery settlers organized another election, in which pro-slavery settlers refused to partake. The conflict led to the emergence of two opposing legislatures on the Kansas territory.

It was not long until the clashes between slavery opponents and supporters became violent. As the number of deaths was rising, the territory was nicknamed “Bleeding Kansas.” After a series of events that included President Pierce’s attempts to disperse violence, Congress did not recognize the constitution drawn up by the pro-slavery settlers. Eventually, the anti-slavery sentiment came to dominate the scene, and on January 29, 1861, right before the start of the Civil War, Kansas was admitted to the Union as a free state.

The Dred Scott Case

Following the controversial 1854 Kansas-Nebraska Act , the Dred Scott case was yet another event that increased tension between pro- and anti-slavery factions in the Nothern and Southern regions of the US (Shi & Tindall, 2016). Also known as Dred Scott v. Sandford , the Dred Scott case was a decades-long fight for freedom by a Black enslaved man and his wife. Dred Scott and his wife, Harriet, were the property of John Emerson who moved several times throughout his life, taking his slaves to different states, including those where slavery was prohibited. After John Emerson’s death, his wife, Irene inherited the slaves who at that point, wanted to be freed. The woman refused, which led Dred and Harriet to file a lawsuit on the grounds of wrongful enslavement. After being brought to several courts, the case ended in the outcome favoring the pro-slavery sentiment, which, however, allowed the anti-slavery North to gain a momentum and consolidate around the issue.

The Election of Abraham Lincoln

Indeed, many events led to the eventual secession of several states (South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas) from the Union. Yet, the final straw that caused the start of the Civil War was the election of Abraham Lincoln. When he was elected, Lincoln was a little-known Illinois legislator. Yet, he led the newly formed Republican party to victory against three major party candidates. Today, it is argued that what enabled Lincoln’s victory was the deep schism and inability to see eye to eye in the Democratic party. Both Democrats Douglas and Breckinridge supported popular sovereignty, though they had opposing views on the federal slave code (Woodworth & Higham 1996). The candidate from another young political party, the Constitutional Union, Bell sought to avoid the slavery issue altogether (Woodworth & Higham 1996). The election of an antislavery northerner as the 16th President of the United States enraged many southerners. Lincoln won without a single Southern electoral vote, which made Southerners feel as if their interests were dismissed and neglected.

The Counterargument and Its Validity

Even though today, the majority of historians agree that it was the economic, political, and social issues of slavery that led to the 1861 outbreak, there is a minor group of historical revisionists who think differently. The Lost Cause of the Confederacy , or simply the Lost Cause , is an American pseudo-historical, negationist theory that defends the Confederate States and their motivation to fight in the Civil War (Bonekemper 2015). Namely, the Lost Cause states that the cause of the Confederate States’ military actions was not only just but borderline heroic. Allegedly, the states were fighting to preserve the Southern way of living in the face of increasing aggression from the Union (Bonekemper 2015). The Lost Cause theory almost completely ignores the reality of slavery and its impact on the dynamics between the Northern and Southern states. Today, it is argued that such historical negationism served the purpose of perpetuating white supremacy in the form of nationwide policies such as the Jim Crow laws.

The historical thought negating the role of slavery persisted to this day. The most widespread myth about the causes of the Civil War has found its way into history books and school curriculums. Loewen (2008), the author of “The Confederate and Neo-Confederate Reader: The ‘Great Truth’ about the ‘Lost Cause,’” reports that between 60% and 75% of school history teachers emphasize state rights as the cause of the Civil War. However, as argued by Loewen, the original documents of the Confederacy show how much the war revolved around slavery. For instance, when declaring its secession from the Union, Mississippi stated that “[its] position [was] thoroughly identified with the institution of slavery — the greatest material interest of the world (Loewen 2008).” Similarly, Texas justified its decision to secede by saying that “[Black people] were rightfully held and regarded as an inferior and dependent race.” According to the document, only slavery could make their presence on American soil “beneficial or tolerable (Loewen 2008).”

As seen from these two excerpts, the Confederate states were outspoken about their stance on slavery and its role in economics and politics. It was slavery that motivated them to make decisions as radical and profound as secession. Therefore, it is not correct to downplay slavery when discussing the causes of the Civil War. Yet, one can readily imagine why such views are likely to persist. Southerners may be reluctant to demonize their ancestors and feel defensive about their own legacy. Besides, the persistence of the Lost Cause helps to uphold institutionalized racism and serve White people’s interests before Black people’s interests.

The American Civil War is the deadliest war that has ever taken place on American soil. It was a turning point for the United States and shaped the way Americans live today. At present, there is little doubt that the main trigger for the Civil War was the issue of slavery and its political and economic implications. Before the start of the war, Southern states were inferior to Northern states economically as they relied heavily on slave labor and large-scale farming. The growing abolitionist sentiment endangered the very backbone of the Southern economy. After several acts and court rulings that could not reconcile proslavery and antislavery advocates, the election of Abraham Lincoln was the final straw that led to the secession of six states. Today, some people still support the Lost Cause theory that negates slavery as the main cause of the Civil War. The theory does not find any supporting historical evidence and is likely used by White supremacists to defend their views.

Bonekemper, Edward H. 2015. The Myth of the Lost Cause: Why the South Fought the Civil War and Why the North Won . New York: Simon and Schuster.

Duberman, Martin B. 2015. The Antislavery Vanguard: New Essays on the Abolitionists . Princeton: Princeton University Press.

Loewen, James W. 2008. Lies My Teacher Told Me: Everything Your American History Textbook Got wrong . New York: The New Press.

Shi, David E., & Tindall, George Brown. 2016. America: A Narrative History . New York: WW Norton & Company.

Woodworth, Steven E. & Robert Higham. 1996. The American Civil War: A Handbook of Literature and Research . Greenwood Publishing Group.

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The Causes of the American Civil War: A Historian‘s Perspective

• by history tools
• May 26, 2024

The American Civil War (1861-1865) was a defining moment in the nation‘s history, a bloody conflict that pitted North against South and left an indelible mark on American society. As historians, we have long sought to understand the complex web of causes that led to this devastating war. In this comprehensive overview, we‘ll explore the economic, political, social, and cultural factors that contributed to the growing tensions between the Northern and Southern states, ultimately culminating in the outbreak of the Civil War.

The Economic Divide: Industry vs. Agriculture

One of the most significant underlying causes of the Civil War was the stark economic differences between the North and the South. The Industrial Revolution had transformed the Northern economy, with manufacturing, commerce, and wage labor becoming increasingly important. By 1860, the North produced over 90% of the nation‘s manufactured goods, and its population was rapidly growing due to immigration and urbanization.

In contrast, the Southern economy remained predominantly agricultural, with slave labor and cash crops like cotton, tobacco, and sugar forming the backbone of the region‘s wealth. The South‘s commitment to an agrarian way of life and its reliance on slave labor made it resistant to the kind of economic diversification and modernization that was taking place in the North.

Table 1: Economic differences between the North and the South on the eve of the Civil War. Sources: U.S. Census Bureau, Historical Statistics of the United States.

These economic differences had far-reaching political and social consequences. Northern politicians increasingly favored policies that promoted industrialization, infrastructure development, and westward expansion, while Southern politicians sought to protect the interests of slaveholders and maintain the South‘s distinct way of life.

The Political Landscape: Polarization and the Rise of the Republican Party

The decades leading up to the Civil War saw a marked increase in political polarization between the North and the South. The Second Party System, which had dominated American politics since the 1830s, began to break down as the Whig Party collapsed and the Republican Party emerged as a powerful new force in the North.

The Republican Party, founded in 1854, was united in its opposition to the expansion of slavery into new territories. Its rise to prominence in the late 1850s, culminating in Abraham Lincoln‘s election as president in 1860, represented a major shift in the political landscape and a direct challenge to Southern interests.

Meanwhile, the Democratic Party, which had long been a national party with a strong presence in both the North and the South, became increasingly divided along regional lines. Northern Democrats, like Stephen A. Douglas, sought to maintain the party‘s unity by advocating for popular sovereignty and compromise on the issue of slavery‘s expansion. Southern Democrats, on the other hand, grew increasingly militant in their defense of slavery and states‘ rights.

The breakdown of the two-party system and the increasing polarization between Northern and Southern politicians created a toxic political environment that made compromise increasingly difficult. As the historian Eric Foner argues, "The political system had proved incapable of finding a middle ground between an increasingly confident and assertive North and an increasingly defensive and belligerent South."

The Abolitionist Movement and Changing Public Opinion

The growth of the abolitionist movement in the North also played a significant role in heightening tensions between the regions. Abolitionists, who sought to end slavery immediately and without compensation to slaveholders, were a small but vocal minority in the early 19th century. However, their influence grew over time as they tapped into a growing moral outrage over the brutality and inhumanity of slavery.

Prominent abolitionists like Frederick Douglass, a former slave who became a renowned orator and writer, and William Lloyd Garrison, the founder of the radical abolitionist newspaper "The Liberator," helped to shape public opinion in the North and fuel anti-slavery sentiment. The publication of Harriet Beecher Stowe‘s novel "Uncle Tom‘s Cabin" in 1852, which depicted the horrors of slavery in vivid detail, further galvanized Northern opposition to the institution.

As abolitionist sentiment grew in the North, Southern leaders became increasingly defensive and paranoid. They viewed the abolitionist movement as a direct threat to their way of life and an assault on their property rights. The fear of slave revolts, fueled by events like John Brown‘s failed raid on Harpers Ferry in 1859, led to an increasingly militant defense of slavery as a positive good.

States‘ Rights and the Road to Secession

The concept of states‘ rights, which held that individual states had the authority to nullify federal laws they deemed unconstitutional, was another key factor in the lead-up to the Civil War. This idea had deep roots in American political thought, dating back to the Kentucky and Virginia Resolutions of 1798, which asserted the right of states to reject the Alien and Sedition Acts.

In the decades before the Civil War, Southern politicians increasingly invoked states‘ rights as a means of protecting slavery and resisting what they saw as federal overreach. The Nullification Crisis of the 1830s, in which South Carolina threatened to secede over a federal tariff that favored Northern industries, was an early example of this trend.

The debate over states‘ rights came to a head with the election of Abraham Lincoln as president in 1860. Lincoln, a Republican, was widely seen as hostile to Southern interests, despite his repeated assurances that he would not interfere with slavery where it already existed. In response to his election, seven Southern states seceded from the Union before his inauguration, forming the Confederate States of America.

The secession of Southern states was the culmination of decades of growing tensions and a direct result of the failure of the American political system to resolve the issue of slavery‘s expansion. As the historian James M. McPherson notes, "The Civil War started because of uncompromising differences between the free and slave states over the power of the national government to prohibit slavery in the territories that had not yet become states."

Key Events on the Road to War

Several specific events and pieces of legislation in the 1850s also contributed to the growing divide between North and South and the eventual outbreak of the Civil War:

The Compromise of 1850: This complex package of bills, which admitted California as a free state and strengthened the Fugitive Slave Act, was an attempt to resolve the issue of slavery‘s expansion. However, it ultimately satisfied neither North nor South and only delayed the inevitable conflict.

The Kansas-Nebraska Act (1854): This act, which allowed settlers in new territories to decide for themselves whether to allow slavery, led to violent clashes between pro-slavery and anti-slavery factions in "Bleeding Kansas." It also contributed to the rise of the Republican Party and the breakdown of the Second Party System.

The Dred Scott Decision (1857): In this infamous Supreme Court case, the court ruled that African Americans were not citizens and that Congress could not ban slavery in the territories. The decision outraged Northerners and further inflamed tensions between the regions.

The Lincoln-Douglas Debates (1858): The series of debates between Abraham Lincoln and Stephen A. Douglas during the Illinois Senate campaign focused heavily on the issue of slavery‘s expansion. Lincoln‘s strong performance in the debates, though he ultimately lost the election, helped to establish him as a national figure and a leading voice in the Republican Party.

These events, along with the ongoing struggle over slavery‘s expansion and the increasing polarization of American politics, set the stage for the secession crisis of 1860-61 and the outbreak of the Civil War.

Conclusion: The Civil War‘s Enduring Legacy

The American Civil War was the product of a complex set of economic, political, social, and cultural factors that had been building for decades. The stark differences between the industrializing North and the slave-based agrarian South, the rise of the abolitionist movement and changing public opinion on slavery, the debate over states‘ rights and federal authority, and the increasing polarization of American politics all contributed to the growing tensions that ultimately erupted into war.

The Civil War‘s impact on American society cannot be overstated. The conflict resulted in the deaths of over 600,000 Americans, the destruction of much of the South‘s infrastructure and economy, and the end of slavery as a legal institution in the United States. It also set the stage for the long and difficult process of Reconstruction, as the nation struggled to rebuild and redefine itself in the war‘s aftermath.

Today, the legacy of the Civil War continues to shape American politics, culture, and identity. The issues that divided the nation in the 19th century – race, regionalism, federal vs. state power – still resonate in contemporary debates and controversies. As historians, it is our task to continue to study and interpret this pivotal event in American history, seeking to understand its causes, its consequences, and its enduring relevance to the nation we have become.

The Civil War reminds us of the fragility of our democratic institutions and the importance of finding common ground and compromise in the face of deep-seated differences. It also underscores the ongoing struggle for equality, justice, and the fulfillment of the American promise of liberty and opportunity for all. By understanding the complex origins of this defining conflict, we can gain valuable insights into the challenges and opportunities that continue to shape our nation today.

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From States’ Rights to Slavery: What Caused the American Civil War?

The Northern and Southern sections of the United States developed along different lines. The South remained a predominantly agrarian economy while the North became more and more industrialized. Different social cultures and political beliefs developed. All of this led to disagreements on issues such as taxes, tariffs and internal improvements as well as states’ rights versus federal rights. At the crux of it all, however, was the fight over slavery.

Causes of the Civil War

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The burning issue that led to the disruption of the union was the debate over the future of slavery. That dispute led to secession, and secession brought about a war in which the Northern and Western states and territories fought to preserve the Union, and the South fought to establish Southern independence as a new confederation of states under its own constitution.

The agrarian South utilized slaves to tend its large plantations and perform other duties. On the eve of the Civil War, some 4 million Africans and their descendants toiled as slave laborers in the South. Slavery was interwoven into the Southern economy even though only a relatively small portion of the population actually owned slaves. Slaves could be rented or traded or sold to pay debts. Ownership of more than a handful of slaves bestowed respect and contributed to social position, and slaves, as the property of individuals and businesses, represented the largest portion of the region’s personal and corporate wealth, as cotton and land prices declined and the price of slaves soared.

The states of the North, meanwhile, one by one had gradually abolished slavery. A steady flow of immigrants, especially from Ireland and Germany during the potato famine of the 1840s and 1850s, insured the North a ready pool of laborers, many of whom could be hired at low wages, diminishing the need to cling to the institution of slavery.

Th e Dred Scott Decision

Dred Scott was a slave who sought citizenship through the American legal system, and whose case eventually ended up in the Supreme Court. The famous Dred Scott Decision in 1857 denied his request stating that no person with African blood could become a U.S. citizen. Besides denying citizenship for African-Americans, it also overturned the Missouri Compromise of 1820, which had restricted slavery in certain U.S. territories.

States’ Rights

States’ Rights refers to the struggle between the federal government and individual states over political power. In the Civil War era, this struggle focused heavily on the institution of slavery and whether the federal government had the right to regulate or even abolish slavery within an individual state. The sides of this debate were largely drawn between northern and southern states, thus widened the growing divide within the nation.

Abolitionist Movement

By the early 1830s, those who wished to see that institution abolished within the United States were becoming more strident and influential. They claimed obedience to “higher law” over obedience to the Constitution’s guarantee that a fugitive from one state would be considered a fugitive in all states. The fugitive slave act along with the publishing of Harriet Beecher Stowe’s Uncle Tom’s Cabin helped expand the support for abolishing slavery nationwide.

Harriet Beecher S towe’s Uncle Tom’s Cabin

Harriet Beecher Stowe’s anti-slavery novel Uncle Tom’s Cabins was published in serial form in an anti-slavery newspaper in 1851 and in book format in 1852. Within two years it was a nationwide and worldwide bestseller. Depicting the evils of slavery, it offered a vision of slavery that few in the nation had seen before. The book succeeded at its goal, which was to start a wave of anti-slavery sentiment across the nation. Upon meeting Stowe, President Lincoln remarked, “So you’re the little woman who wrote the book that started this great war.”

The Underground Railroad

Some abolitionists actively helped runaway slaves to escape via “the Underground Railroad,” and there were instances in which men, even lawmen, sent to retrieve runaways were attacked and beaten by abolitionist mobs. To the slave holding states, this meant Northerners wanted to choose which parts of the Constitution they would enforce, while expecting the South to honor the entire document. The most famous activist of the underground railroad was Harriet Tubman , a nurse and spy in the Civil War and known as the Moses of her people.

The Missouri Compromise

Additional territories gained from the U.S.–Mexican War of 1846–1848 heightened the slavery debate. Abolitionists fought to have slavery declared illegal in those territories, as the Northwest Ordinance of 1787 had done in the territory that became the states of Ohio, Indiana, Illinois, Michigan and Wisconsin. Advocates of slavery feared that if the institution were prohibited in any states carved out of the new territories the political power of slaveholding states would be diminished, possibly to the point of slavery being outlawed everywhere within the United States. Pro- and anti-slavery groups rushed to populate the new territories.

In Kansas, particularly, violent clashes between proponents of the two ideologies occurred. One abolitionist in particular became famous—or infamous, depending on the point of view—for battles that caused the deaths of pro-slavery settlers in Kansas. His name was John Brown. Ultimately, he left Kansas to carry his fight closer to the bosom of slavery.

The Raid On Harpers Ferry

On the night of October 16, 1859, Brown and a band of followers seized the federal arsenal at Harpers Ferry, Virginia (now West Virginia), in what is believed to have been an attempt to arm a slave insurrection. (Brown denied this at his trial, but evidence indicated otherwise.) They were dislodged by a force of U.S. Marines led by Army lieutenant colonel Robert E. Lee.

Brown was swiftly tried for treason against Virginia and hanged. Southern reaction initially was that his acts were those of a mad fanatic, of little consequence. But when Northern abolitionists made a martyr of him, Southerners came to believe this was proof the North intended to wage a war of extermination against white Southerners. Brown’s raid thus became a step on the road to war between the sections.

T he Election Of Abraham Lincoln

Exacerbating tensions, the old Whig political party was dying. Many of its followers joined with members of the American Party (Know-Nothings) and others who opposed slavery to form a new political entity in the 1850s, the Republican Party. When the Republican candidate Abraham Lincoln won the 1860 presidential election, Southern fears that the Republicans would abolish slavery reached a new peak. Lincoln was an avowed opponent of the expansion of slavery but said he would not interfere with it where it existed.

Southern Secession

That was not enough to calm the fears of delegates to an 1860 secession convention in South Carolina. To the surprise of other Southern states—and even to many South Carolinians—the convention voted to dissolve the state’s contract with the United States and strike off on its own.

South Carolina had threatened this before in the 1830s during the presidency of Andrew Jackson , over a tariff that benefited Northern manufacturers but increased the cost of goods in the South. Jackson had vowed to send an army to force the state to stay in the Union, and Congress authorized him to raise such an army (all Southern senators walked out in protest before the vote was taken), but a compromise prevented the confrontation from occurring.

Perhaps learning from that experience the danger of going it alone, in 1860 and early 1861 South Carolina sent emissaries to other slave holding states urging their legislatures to follow its lead, nullify their contract with the United States and form a new Southern Confederacy. Six more states heeded the siren call: Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas. Others voted down secession—temporarily.

Fort Sumter

On April 10, 1861, knowing that resupplies were on their way from the North to the federal garrison at Fort Sumter in the harbor of Charleston, South Carolina, provisional Confederate forces in Charleston demanded the fort’s surrender. The fort’s commander, Major Robert Anderson, refused. On April 12, the Confederates opened fire with cannons. At 2:30 p.m. the following day, Major Anderson surrendered.

War had begun. Lincoln called for volunteers to put down the Southern rebellion. Virginia, Arkansas, North Carolina and Tennessee, refusing to fight against other Southern states and feeling that Lincoln had exceeded his presidential authority, reversed themselves and voted in favor of session. The last one, Tennessee, did not depart until June 8, nearly a week after the first land battle had been fought at Philippi in Western Virginia. (The western section of Virginia rejected the session vote and broke away, ultimately forming a new, Union-loyal state, West Virginia. Other mountainous regions of the South, such as East Tennessee, also favored such a course but were too far from the support of Federal forces to attempt it.)

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Home — Essay Samples — War — American Civil War — The Civil War: Causes, Course, Impact

The Civil War: Causes, Course, Impact

• Categories: American Civil War

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Published: Jan 30, 2024

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Table of contents

Causes of the civil war, economic factors, political factors, social factors, the course of the civil war, initial battles and military strategies, turning points in the war, final stages and end of the war, impact of the civil war, political consequences, economic consequences, social and cultural consequences.

• "The Civil War." History.com, A&E Television Networks, 2009, www.history.com/topics/american-civil-war. Accessed 10 Oct. 2021.
• McPherson, James M. "Causes of the Civil War." OAH Magazine of History, vol. 8, no. 1, 1998, pp. 25-30.
• Gallagher, Gary W. "The Union War." The American Historical Review, vol. 119, no. 5, 2014, pp. 1659-1660.

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By: History.com Editors

Updated: April 20, 2023 | Original: October 15, 2009

The Civil War in the United States began in 1861, after decades of simmering tensions between northern and southern states over slavery, states’ rights and westward expansion. The election of Abraham Lincoln in 1860 caused seven southern states to secede and form the Confederate States of America; four more states soon joined them. The War Between the States, as the Civil War was also known, ended in Confederate surrender in 1865. The conflict was the costliest and deadliest war ever fought on American soil, with some 620,000 of 2.4 million soldiers killed, millions more injured and much of the South left in ruin.

Causes of the Civil War

In the mid-19th century, while the United States was experiencing an era of tremendous growth, a fundamental economic difference existed between the country’s northern and southern regions.

In the North, manufacturing and industry was well established, and agriculture was mostly limited to small-scale farms, while the South’s economy was based on a system of large-scale farming that depended on the labor of Black enslaved people to grow certain crops, especially cotton and tobacco.

Growing abolitionist sentiment in the North after the 1830s and northern opposition to slavery’s extension into the new western territories led many southerners to fear that the existence of slavery in America —and thus the backbone of their economy—was in danger.

Did you know? Confederate General Thomas Jonathan Jackson earned his famous nickname, "Stonewall," from his steadfast defensive efforts in the First Battle of Bull Run (First Manassas). At Chancellorsville, Jackson was shot by one of his own men, who mistook him for Union cavalry. His arm was amputated, and he died from pneumonia eight days later.

In 1854, the U.S. Congress passed the Kansas-Nebraska Act , which essentially opened all new territories to slavery by asserting the rule of popular sovereignty over congressional edict. Pro- and anti-slavery forces struggled violently in “ Bleeding Kansas ,” while opposition to the act in the North led to the formation of the Republican Party , a new political entity based on the principle of opposing slavery’s extension into the western territories. After the Supreme Court’s ruling in the Dred Scott case (1857) confirmed the legality of slavery in the territories, the abolitionist John Brown’s raid at Harper’s Ferry in 1859 convinced more and more southerners that their northern neighbors were bent on the destruction of the “peculiar institution” that sustained them. Abraham Lincoln ’s election in November 1860 was the final straw, and within three months seven southern states—South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana and Texas—had seceded from the United States.

Outbreak of the Civil War (1861)

Even as Lincoln took office in March 1861, Confederate forces threatened the federal-held Fort Sumter in Charleston, South Carolina. On April 12, after Lincoln ordered a fleet to resupply Sumter, Confederate artillery fired the first shots of the Civil War. Sumter’s commander, Major Robert Anderson, surrendered after less than two days of bombardment, leaving the fort in the hands of Confederate forces under Pierre G.T. Beauregard. Four more southern states—Virginia, Arkansas, North Carolina and Tennessee—joined the Confederacy after Fort Sumter. Border slave states like Missouri, Kentucky and Maryland did not secede, but there was much Confederate sympathy among their citizens.

Though on the surface the Civil War may have seemed a lopsided conflict, with the 23 states of the Union enjoying an enormous advantage in population, manufacturing (including arms production) and railroad construction, the Confederates had a strong military tradition, along with some of the best soldiers and commanders in the nation. They also had a cause they believed in: preserving their long-held traditions and institutions, chief among these being slavery.

In the First Battle of Bull Run (known in the South as First Manassas) on July 21, 1861, 35,000 Confederate soldiers under the command of Thomas Jonathan “Stonewall” Jackson forced a greater number of Union forces (or Federals) to retreat towards Washington, D.C., dashing any hopes of a quick Union victory and leading Lincoln to call for 500,000 more recruits. In fact, both sides’ initial call for troops had to be widened after it became clear that the war would not be a limited or short conflict.

The Civil War in Virginia (1862)

George B. McClellan —who replaced the aging General Winfield Scott as supreme commander of the Union Army after the first months of the war—was beloved by his troops, but his reluctance to advance frustrated Lincoln. In the spring of 1862, McClellan finally led his Army of the Potomac up the peninsula between the York and James Rivers, capturing Yorktown on May 4. The combined forces of Robert E. Lee and Jackson successfully drove back McClellan’s army in the Seven Days’ Battles (June 25-July 1), and a cautious McClellan called for yet more reinforcements in order to move against Richmond. Lincoln refused, and instead withdrew the Army of the Potomac to Washington. By mid-1862, McClellan had been replaced as Union general-in-chief by Henry W. Halleck, though he remained in command of the Army of the Potomac.

Lee then moved his troops northwards and split his men, sending Jackson to meet Pope’s forces near Manassas, while Lee himself moved separately with the second half of the army. On August 29, Union troops led by John Pope struck Jackson’s forces in the Second Battle of Bull Run (Second Manassas). The next day, Lee hit the Federal left flank with a massive assault, driving Pope’s men back towards Washington. On the heels of his victory at Manassas, Lee began the first Confederate invasion of the North. Despite contradictory orders from Lincoln and Halleck, McClellan was able to reorganize his army and strike at Lee on September 14 in Maryland, driving the Confederates back to a defensive position along Antietam Creek, near Sharpsburg.

On September 17, the Army of the Potomac hit Lee’s forces (reinforced by Jackson’s) in what became the war’s bloodiest single day of fighting. Total casualties at the Battle of Antietam (also known as the Battle of Sharpsburg) numbered 12,410 of some 69,000 troops on the Union side, and 13,724 of around 52,000 for the Confederates. The Union victory at Antietam would prove decisive, as it halted the Confederate advance in Maryland and forced Lee to retreat into Virginia. Still, McClellan’s failure to pursue his advantage earned him the scorn of Lincoln and Halleck, who removed him from command in favor of Ambrose E. Burnside . Burnside’s assault on Lee’s troops near Fredericksburg on December 13 ended in heavy Union casualties and a Confederate victory; he was promptly replaced by Joseph “Fighting Joe” Hooker , and both armies settled into winter quarters across the Rappahannock River from each other.

After the Emancipation Proclamation (1863-4)

Lincoln had used the occasion of the Union victory at Antietam to issue a preliminary Emancipation Proclamation , which freed all enslaved people in the rebellious states after January 1, 1863. He justified his decision as a wartime measure, and did not go so far as to free the enslaved people in the border states loyal to the Union. Still, the Emancipation Proclamation deprived the Confederacy of the bulk of its labor forces and put international public opinion strongly on the Union side. Some 186,000 Black Civil War soldiers would join the Union Army by the time the war ended in 1865, and 38,000 lost their lives.

In the spring of 1863, Hooker’s plans for a Union offensive were thwarted by a surprise attack by the bulk of Lee’s forces on May 1, whereupon Hooker pulled his men back to Chancellorsville. The Confederates gained a costly victory in the Battle of Chancellorsville , suffering 13,000 casualties (around 22 percent of their troops); the Union lost 17,000 men (15 percent). Lee launched another invasion of the North in June, attacking Union forces commanded by General George Meade on July 1 near Gettysburg, in southern Pennsylvania. Over three days of fierce fighting, the Confederates were unable to push through the Union center, and suffered casualties of close to 60 percent.

Meade failed to counterattack, however, and Lee’s remaining forces were able to escape into Virginia, ending the last Confederate invasion of the North. Also in July 1863, Union forces under Ulysses S. Grant took Vicksburg (Mississippi) in the Siege of Vicksburg , a victory that would prove to be the turning point of the war in the western theater. After a Confederate victory at Chickamauga Creek, Georgia, just south of Chattanooga, Tennessee, in September, Lincoln expanded Grant’s command, and he led a reinforced Federal army (including two corps from the Army of the Potomac) to victory in the Battle of Chattanooga in late November.

Toward a Union Victory (1864-65)

In March 1864, Lincoln put Grant in supreme command of the Union armies, replacing Halleck. Leaving William Tecumseh Sherman in control in the West, Grant headed to Washington, where he led the Army of the Potomac towards Lee’s troops in northern Virginia. Despite heavy Union casualties in the Battle of the Wilderness and at Spotsylvania (both May 1864), at Cold Harbor (early June) and the key rail center of Petersburg (June), Grant pursued a strategy of attrition, putting Petersburg under siege for the next nine months.

Sherman outmaneuvered Confederate forces to take Atlanta by September, after which he and some 60,000 Union troops began the famous “March to the Sea,” devastating Georgia on the way to capturing Savannah on December 21. Columbia and Charleston, South Carolina, fell to Sherman’s men by mid-February, and Jefferson Davis belatedly handed over the supreme command to Lee, with the Confederate war effort on its last legs. Sherman pressed on through North Carolina, capturing Fayetteville, Bentonville, Goldsboro and Raleigh by mid-April.

Meanwhile, exhausted by the Union siege of Petersburg and Richmond, Lee’s forces made a last attempt at resistance, attacking and captured the Federal-controlled Fort Stedman on March 25. An immediate counterattack reversed the victory, however, and on the night of April 2-3 Lee’s forces evacuated Richmond. For most of the next week, Grant and Meade pursued the Confederates along the Appomattox River, finally exhausting their possibilities for escape. Grant accepted Lee’s surrender at Appomattox Court House on April 9. On the eve of victory, the Union lost its great leader: The actor and Confederate sympathizer John Wilkes Booth assassinated President Lincoln at Ford’s Theatre in Washington on April 14. Sherman received Confederate General Joseph E. Johnston's surrender at Durham Station, North Carolina on April 26, effectively ending the Civil War.

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