These aren't plausible.
The United States could with a LOT of bad luck, incompetence, and really just plain wanking of the other side find itself on the losing end of a major shooting war that involves one or more of its most vital allies in the 20th century but the odds of that are somewhere between slim, none, and when Hell freezes over.
An America with occupation zones is as impossible as doing it to China, Indonesia, or Russia, you just don't occupy a landmass large enough to be a continent of itself with a massive population to boot and expect to hold it past the first day. In case it's hard to see: there's a lot of freaking land and people in the United States, anemic has-been empires like Austria-Hungary or the Ottomans will be out on their asses within the first few months, more affluent powers like the British will soon follow them. Really it isn't that hard for the USA to fight a partisan conflict with all the advantages at its disposal. It's the Vietnam problem times a billion: a local population will fight for what it perceives to be its own and be willing to take horrendous casualties for it if it means the achievement of their goal, foreign powers will get tired of sustaining their presence long before the locals get tired of fighting and dying to kick them out.