Check the 3 parts of the Missouri Compromise.
1.Free and Slave states must enter the Union in pairs.
2.Slavery was legal above the 36-30 line.
3.California entered as a free state.
4.Missouri entered as a slave state.
5.Banned the slave trade in Washington, D.C.
6.All territories could vote on the issue of slavery.
7.Slavery was banned above the 36-30 line.