So any seceding state would not only have to fight invading federal forces, it would at the same time have to fight an internal civil war to suppress dissent.
The core deep southern states = LA/MS/AL/GA/SC all have state populations >30% black, and increasing. There continues to be a significant population shift where black Americans are moving to the south.
Well aware of that. Should be a relevant point to those who want to secede. Nothing like a little race war tossed into your secession to liven things up.