This is a complete derailment of this thread haha, but I hate it when people say the US won and ended both World Wars. That is just completely dishonest. Your point has more merit in WW1 though, as one of the reasons for the Ludendorff Offensive was because the US entered the war, the Germans were already on the ropes at that point and knew they were going to lose if they didn't do something drastic, so they went all in. They made massive advances, the biggest since 1914, but it wasn't enough and the failure of the offense ended trench warfare and turned it into a mobile one again. At that point, the Germans days were numbered. You could argue that the US involvement sped up the end of the war, but you have to remember that Germany was fully blockaded, people and the military were starving and they were thinking of negotiating with the West.
As far as WW2, the US had even less of an impact in the European Theater. Theres no doubt we finished off Japan and bore the brunt of that front, but the British and Dutch were also fighting there. The Pacific theater was also a lot smaller in scale as far as land battles, but navel battles were much more important. In Europe, Hitler lost the war as soon as he launched Operation Barbarossa, the invasion of the Soviet Union. The Eastern Front is where the fate of the entire war was decided. Yes, they made massive advances, but the Soviet Union is not a small country, land mass and population speaking haha. Hitler invaded at literally the only time he could. It was not possible to do it sooner as troops were tied up in the Balkans and if he waited, the Soviets would have built up more troops and equipment. They new the days of their treaty with Germany were numbered. They just weren't expecting an invasion so soon. After Barbarossa was underway yes it was largely successful at first, but it was doomed to fail. Even if they had captured Moscow, it wouldn't have mattered as they could just relocate it farther east. The Germans would've probably been kicked out of Moscow during the next offensive. At that point their fate was sealed. The Germans didn't attack Moscow again during the Spring of 1942 because the Soviets had massed troops there and that offensive would've failed. So they attacked South. The Soviets reacted, drew them into Stalingrad then destroyed an entire Army in and around the city. At that point the Germans were on the ropes, again. They're last effort was at Kursk, that failed in the summer of 1943 and at that point the Germans were in a fighting retreat/route for the remainder of the war.
Yes, again, the US helped though lend lease and drawing troops away from the Eastern Front, but the war was lost for Germany in 1941. The US did help speed it up, but Soviets would've been in Berlin eventually.
