Hmm, sounds like a Scifi novel.
Lets see:
- 13 old states, either the rest of the US of A or a british protectorate/colony
- Texas is independent, of course
- the rest of the southern states go either back to Mexico or will become some new latin republic
- Arnie becomes president of the People's republic of California
- the South rises again, but this time as an african american nation
- The lakes area gets absorbed into Canada
- The Sioux and other Indians renounce all treaties, go on war path and take their land back
Germany could annex Pennsylvania, though...