How did Kansas get the nickname bleeding Kansas?

Bloody Kansas became the nickname of Kansas. The Missouri Compromise said that whatever the people of Kansas wanted, slaves or no slaves would be decided by who lived there. So lots of people from both sides moved to Kansas and there were many fights. Abolitionist John Brown tried to influence people against slavery. Thugs from Missouri came to push for slavery. Federal troops had to be called in to bring peace and stop the murders. There were four constitutions for Kansas. The Topeka Constitution would have banned slavery. The Lecompton Constitution allowed slavery. The Leavenworth Constitution would have made Blacks citizens and given women rights. The Wyandotte Constitution was finally passed by Kansas and rejected by the US Senate until 11 slave states seceded from the Union. Kansas became a state on January 29, 1861.