Even after a century and a half, historians passionately debate about what exactly were the American Civil War causes. Here are the most important ones.

1. 13 Causes That Led to the American Civil War
1. Slavery
Source: http://www.historyly.com/american-history/american-civil-war-causes/

2. 2. Growing economic differences
3. Dred Scott’s decision

3. 4. State rights
5. Abolitionist movement

4. 6. Uncle Tom’s Cabin
7. The subway

5. 8. The Missouri Compromise
9. Raid on Harper’s Ferry

6. 10. Lincoln’s election
11. The southern secession

7. 12. Bleeding Kansas
13. Attack on Fort Sumter