21 May 1856: Sack of Lawrence,Pro-slavery forces attacked and looted the anti-slavery town of Lawrence, Kansas, during "Bleeding Kansas."
2
1857
6 Mar 1857: Dred Scott decision,The Supreme Court ruled that African Americans were not citizens and that the Missouri Compromise was unconstitutional.
3
1858
15 Oct 1858: Lincoln-Douglas Debates,Abraham Lincoln and Stephen Douglas held a series of seven debates on the issue of slavery in Illinois.