Bingo. American industry, British intelligence, and Russian Blood won the war in Europe. It was always a combined effort, and anyone claiming one power could have won alone is talking nonsense.

With American supplies, the USSR might have been able to defeat Germany without the Allies sending ground forces into Europe. However, there’s no way the Red Army could have defeated both Germany and Japan alone. The United States was the major force in the Pacific theater.

Things would have gone smoother for them if the British didn't slow them down with Yugoslavia.

Good chance they would have captured Moscow and Stalin.

Outside of industry the US didn’t impact much

The Western Front was going to be won without them due to German troop and supply limitations

The US war effort was the Pacific and preventing the USSR from taking all of Germany (Allies made it in time)