I am working on a scenario where the Allies lost the war in Europe but 'won' in the Pacific. The one thing that I have yet to deal with is what happened to America, which would have probably become a third theatre of the war in my scenario. I have something that I think is reasonable for the rest of the world, but not America. Thoughts, ideas, suggestions? I want something perfectly reasonable to explain the disintegration of the Untied States following a joint but very pyrrhic victory alongside the British vs Japan and utter defeat in Europe and possibly in the Americas.