Well...If USA win nothing happens?
I haven't scripted the whole mod from beginning to the end.
I have scripted a whole series of possibilities that will hopefully make an entertaining mod for the player.
For whatever nation you play (majors) you should find the ai is busy making war elsewhere. It will be up the the player to decide what course he wishes to take.
As a USA player for instance, you will not have a definite course of events, it will vary according to random decisions of the ai. So, in one game you may find France is your ally and is fighting England. In another game, France may be fighting you. Or, in another game, France may stay neutral.
If after all of this, the USA regains its total territory back, it will be for the player to decide if he wants to attack the other powers. He could be at war with Jap, Eng, Sov, or Fra by then...?
GER doesn't get involved, well only minimally in the American war, it is too busy building up its forces for its own adventures in the East. Well, that is GER's plan, other powers have their own plans... Which IS scripted!