Bleeding Kansas
Bleeding Kansas was a period of time between 1856 and 1860 that had a lot of conflict between the people that were pro-slavery and anti-slavery, including the revolt and failure of John Brown, who was strongly, perhaps strictly, against slavery.
Bleeding Kansas started from the Kansas-Nebraska Act in 1854, where the Missouri Compromise was nullified and popular sovereignty was introduced to Kansas. This made it so the people decided whether their state would be pro-slavery or anti-slavery, and lots of people moved to Kansas to vote on slavery. That caused a lot of conflict, as many people violently believed in their opinions. In this time, John Brown murdered 5 slaveowners and revolted heavily against everyone pro-slavery. Many anti- and pro-slavery companies paid to send masses of people to go to Kansas to either free it or legalize slavery. John Brown led an organized but crude revolt, with him and his men hacking 5 slaveowners to death with broadswords.