I believe a lot of sectarian violence is the likely outcome throughout the country. Opposing militias will fight things out in small meaningless battles.
I don't see big standing armies somehow being organized and meeting an battlefields somewhere.
A fascist regime may be attempted, but it won't last long. Too many Americans will not be psychologically subdued by military power.
It is time to start looking at more regional government. Funny things is though, there already is a lot of regional government in the USA.
So true that many of the world's boundaries have been set so arbitrarily. It is time for the residents to decide to what province/state they really want to belong to.