re: If the south seceded again,

If some states, not just the former CSA, broke away it wouldn't be to relive the glory days of slavery. I believe that it is altogether likely that the USA will cease to be around in our lifetimes due to rampant corruption and crushing debt with the Federal government growing to unsustainable size. If/when states due seceed, then it will be because of the failure of the Federal government to provide a stable economy. Several states may try to band together, but I think a post USSR style break up would be more liekly, where the now independent states remain independent and form their own countries.