Spending years as a lurker here it's something I didn't see discussed all that much.
Let's just say for discussions sake that TTL's CSA is independent by an 1862 victory that is able to wrangle Kentucky, Indian Territory and Arizona Territory (south of 34th Paralell) from the Union. No Missouri, no Maryland, West Virginia is admitted into the Union. All other border states outside Kentucky are in the Union.
It also should be noted (that if it does ever come up) that the CS constitution doesn't restrict individual CS states from abolishing slavery.
How does it turn out?
And yes, my moniker is named after a "Confederate-everyman" character from TL191.