Connecticut doesn't have slaves because they are illegal to have slaves
After the Civil War, Southern state legislatures attempted to restrict the rights of formerly enslaved persons by "passing Black Codes" which segregated blacks from whites.
I know that they went North from South..
The primary concern was related to the number of congressmen from free and slave states. If Missouri was admitted into the Union as a slave state, the congress would have more Southerners than Northerners in the congress which would be bad for slaves everywhere. Northerners therefore asked that if Missouri enters as a slave state, Maine has to be separated and enter as a free state.<span />
The first one.
The later ones all have some sort of relevant 'life lesson' intertwined in them.