Yes, the breakup will leave the core of Trumpistan in rapid decline. We’re beginning to see it nationally but the lag means we are still running on Obama financials. Unless Trump and all are removed by year end it will come apart next year. It’s very difficult to see all the things in play as this is far larger than the US collapse.
I think we should be able to avoid old fashioned warfare. The major metro regions will devolve to a loose alliance. At least that is the hope but that is only viable with Trump and the fascist groups removed from authority. The steady movement away from taking Trump seriously will prevent most of the ugliness. The problem will be in the south with metropoles surrounded by dead zones and in Texas that will probably breakup also.
Trump needs to be removed first or there will be batches of good ole boys who will get themselves all kitted out and try to save something. It depends how military divides up. The pattern is to isolate and let them run out of beer and food and they’ll go home. There could be skirmishes in Trumpistan because they know they are welfare states.
We’ll just have to see what happens.