I don’t think so. wars aren’t fought like they were in 1860. The US didn’t win Korea, or Vietnam, and hasn’t won Afghanistan yet. Random guerrilla attacks would be the style, and most likely after a time what is left of the bankrupt USA would call it off. That, of course is just my opinion. It would all be a new chess game, that is for sure. When things get bad enough people will rise to the occasion.
And if Texas seceded , it would start a rip right up the center of the country—splitting the country in half. In the end we would have three countries, and a ton of pissed off Chinese who wonder where they will get their coupons cashed.