Historical Timeline

1820	According to the Missouri Compromise of 1820, all territory north of 36 degrees 30 minutes latitude will be free of slavery.
1854	The Kansas-Nebraska act divides the Nebraska Territory in two, popular sovereignty is decided as the means to decide if if Kansas or Nebraska are free or slave states.  Soon proslavery and anti-slavery proponents come head-to-head in a fight over Kansas.
1861	Kansas is admitted as a free state.