re: Can individual states have a civil war without the rest of the nation getting involved?

It's not even really individual states that are in need of a reckoning. It's the isolated liberal strongholds within those states. They're almost all entirely surrounded by red country.

Wouldn't be hard to wage a war of attrition just by shutting down supply lines and playing the waiting game. The stocks they have amassed won't last millions of people very long at all.