Yes, slavery was a cause of the war, but that was not one of the central causes that popular belief has engrained in us all, however, the role that slavery had will be discussed. These reasons all-fed off each other, which eventually resulted in the bloodiest war in American history and affected almost every single American family. The first cause, that was most the popular belief for the cause of the Civil War, was the idea of slavery. Thomas Jefferson believed that slavery was, “Rock upon which the old Union would split” . While there is plenty to discuss why this was the cause of the war, the differences between the North and the South go much deeper then the question of slavery.
The North wanted slaves to be free, the South on the other hand wanted slaves. There were many changes that occurred after the Civil War, some of which, the South did not like and some the North did not completely agree with. The Civil War was one of the bloodiest wars in the United States history. The Northern territory of the US were fighting against the Southern territory. The South wanted to succeed from the United States because, they believed that there should be slavery.
This split the North and South. In reaction to this, some northern states passed laws forbidding state officials to enforce the Fugitive Slave Law, which only angered the southern states. Northerners had become aware of the hypocrisy of slavery and became resolved to end slavery. Many abolitionists started to take action to help slaves escape. This major controversy over the runaway slaves sparked the beginning of the Civil War.
Slavery was opposed by some and supported by others and was clear cut across party lines. In the North a machine economy was arising which relied on wage laborers and not slaves. This lead the Northern Representatives to favoring a strong bill against slavery, but issues arose such as: where the freed black would be placed, how they would survive in the South uneducated, and without possessions. The South was pro slavery for every reason possible; dependent on crop the only way to get the work done was slavery. It was believed that slaves needed slavery so that they would be protected and cared for.
The others treated the slaves like dirt and worked them to death. Although slavery was illegal in the Northern states, only a small proportion of Northerners actively opposed it. Many felt that slavery was wrong but had a air of superiority about blacks, free and enslaved. The main debate between the North and the South on the eve of the war was whether slavery should be permitted in the Western territories recently acquired during the Mexican War (1846-1848), including New Mexico, part of California, and Utah. Opponents of slavery were concerned about its expansion, in part because they did not want to compete against slave labor.
Slavery was also seen as a threat to democracy; Northerners believed that a corrupt oligarchy of rich planters, the Slave Power, dominated Southern politics, and national politics as well. Northerners also objected on moral grounds to being legally required to enforce fugitive slave laws.  Abolitionism as a cause of the war By the 1830s, a small but outspoken abolitionist movement arose, led by New Englanders and free blacks, including William Lloyd Garrison, Frederick Douglass, and Lucretia Mott. Many people North and South considered slavery an undesirable institution, but by the 1840s the militant abolitionists went much further and declared that owning a slave was a terrible sin, and that the institution should be immediately abolished. Southerners bitterly resented this moralistic attack, and also the stereotypical presentation of slave owners as heartless Simon Legrees in the overwhelmingly popular (in the North) book and play by Harriet Beecher Stowe, "Uncle Tom's Cabin" (1852).
Eminent statesmen from the earliest period of the national existence, such as Thomas Jefferson and George Washington regarded slavery as evil but necessary. Individuals and groups of people of almost all sects defended slavery. On the whole, antislavery views grew steadily; but many who personally held strong antislavery opinions hesitated to join actively in abolitionist agitation, unwilling to dispute what many citizens held to be their rights. Those Southern whites who didn't necessarily like slavery supported it because they felt it was the South's right to be able to have slavery. Slavery thus became an increasingly Southern institution.
In an attempt to solve the issue of slavery, both the Fugitive Slave Act and the Kansas-Nebraska Act was passed. However, both acts failed in that it only triggered negative social responses from both sides. Political events, such as the Dred Scott case and the Election of 1860 caused further disputes through public disagreements, adding tensions between the two sides and strengthening sectionalism more than ever. Ultimately, a split nation and another war were caused by a series of differing social and political views, regarding opposing lifestyles and views on slavery. Numerous social issues befell, developing controversy which would later lead to the Civil War.
One way I knew was because of the talk of slavery. During the time of the war, slavery was seen as a good and bad thing. The North was against the idea of slavery and did anything to try to abolish it, while the South supported slavery strongly. Seeing as slavery brought in good labor and economic privileges to the South, I can see why they would support it. What brought both sides into conflict would be the way Southerners treated slaves.
Many Northern abolitionists, including Frederick Jackson, were ashamed of Brown. Most Northern abolitionists were pacifists and tried to emancipate slaves using newspapers, rallies, cartoons, and literature. Moderates on both sides also disliked Brown and his actions. Men like Abraham Lincoln, who wanted to preserve the Union at all costs, felt like Brown’s drastic actions would serve only to be yet another reason for Southerners to secede. As history shows us, Lincoln was right.