Another interesting postwar conflict might be the not inconsiderable amount of influence Confederate expatriates will have in the rest of the world, far from the long arm of the USA. (This is especially true if Texas does get reunited with the USA, since that's one place they wouldn't be able to go). If ex-Confeds flee to South Africa, they might be able to have an interesting influence on that nation's politics. Or, perhaps some Confederate war criminals who got away could flee to Japan? I'm sure Tokyo would love to have them. We could see ex-commandants of concentration camps running prisons in Japanese-occupied China, or acting as some kind of elite anti-partisan unit for the Japanese. Or, depending on how dark the German regime gets, we could see them go there, running camps for "politicals" in Eastern Europe... while that might be a stretch, I could see it if tensions between the US and Germany get bad enough.