I suspect that if the US had stayed out of The Great War, Germany may very well have won, and a certain Austrian painter would have died in anonymity.
By the time the Germans launched their Spring Offensive in 1918, they were nearly dead, but the French were in even worse condition, and the Germans probably would have taken Paris if not stopped by the Americans at Belleau Wood.
The Austrian Painter was connected through his history of homosexual practices to German commanders. That was how he was so close to Ludendorf at the Munich revolt that got him jailed.