[Olog-hai]

In your scenario, such socialistic “seceded” states would seek out the aid of the enemies of the USA, just as they’ve been doing up until this point, but this time militarily. That of course would not be a civil war resulting from that.

[magooey]

North American above the Rio Grande has been shared between two countries for at least 150 years. Is it necessarily the case that there cannot be three countries sharing this portion of the continent without major conflict?