You might say that Nazi Germany lost WWII because they chose to foolishly invade the Soviet Union, and then Hitler ignored his best Generals advice and made foolish blunder after foolish blunder. But you really can’t, because I firmly believe that without the United States assistance in terms of machinery, man power, ships, and economic support there is no way Britain would have been successful in invading from the West, forcing the Germans to wage war on two fronts. Germany may have been able to fight Russia to a stand-still at the vertical least, and Britain would’ve happily kept their island Nation status a bit longer.
Instead, with the US help, Russia and the rest of the allies defeated the Nazis. But we just didn’t stop there. We were smart enough to recognize the events from the end of WWI led to WWII, and we helped rebuild not just the bystander countries as well as Germany. Then we helped them re-establish a democratic government, and pretty much let them rule themself.
All we asked in return was enough space to bury our dead and a few military bases.