> Slave owners in the south were a very small percentage of the population. The south did not rise up to defend slave owners. They rose up to defend themselves.
This is a really important point and you have been severely misinformed. The states that succeeded were not shy about why. My own home state, South Carolina, after an extensive legal argument that they're allowed to succeed, revealed the great violation of their rights was the refusal to return fugitive slaves.
http://avalon.law.yale.edu/19th_century/csa_scarsec.asp
Someone else already linked to Mississippi.
https://news.ycombinator.com/item?id=18474740
Slavery, to slave holders, was a state's right. That's the right they fought for.