In the Missouri compromise, Missouri was applying to become a state which would upset the equal amount off free and slaves states. After the American/Mexican war, America got a bunch more land which needed to be decided as free or slave states. Next was the Fugitive slave act, then following was the Kansa-Nebraska act. In this act, Kansas and Nebraska would vote whether to be free or slave states. The Dred Scott case came up in 1857 as a result of the Fugitive slave act. Finally in 1860 President Lincoln was elected and made major changes to slavery.
