Just any realistic way the WR stays alive. It can be in a good/shit state as long as it survives to this day.
In terms of military enough to hold France (a normal France that is) for this will be enough,to preserve territorial integrity.
Politically/Economically start/continue rebuilding relations continue rebuilding this will help avoiding the extremists treats or at least limit them, and is always better to fight an war on other people backyard.
Another option will be for Americans to stay in Europe after WWI to guaranty the integrity of Germany, for Germany after the peace treaty become vulnerable to France, exporting her problems
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