After the Kansas Nebraska act, the Kansas territory was going to determine slavery's legality by popular vote.
Slavery should be legal!
No it shouldn't!
Because the legality was determined solely on vote of the population, pro-slavery settlers from Missouri moved into Kansas as well as Anti-Slavery settlers from New York and New England.
Tensions rose in Kansas due to the conflicting ideas regarding slavery. A fervent abolitionist, John Brown, gathered 6 followers and murdered 5 other pro-slavery settlers in what is known as the Pottawatomie Massacre.
Tensions in Kansas emanated to other regions. In 1856, Massachusetts Senator Charles Sumner was beaten by the nephew of Senator Andrew P. Butler of South Carolina (Preston Brooks), an outspoken defender of slavery, and was unable to return to the Senate for 4 years.
Preston Brooks became a hero of the South, and despite resigning his seat in the House of Representatives, he successfully was reelected in South Carolina. Charles Sumner also became a hero in the North, as he represented a martyr to the barbarism of the South.
You know it! Vote for me as a representative!
YeEAHH! You're the best Preston Brooks!
Bleeding Kansas one of the most important events leading to the Civil War. It greatly increased the distance between North and South and demonstrated the inability to compromise over slavery.