> The Soviet Union was responsible for ~80% of german casualties.
None of which would have been possible without the extraordinary industrial might of the US that kept the USSR supplied. They had no capacity to fight minus being supplied.
Do you know how much territory the European allies had reclaimed in the years of fighting prior to the US invasion of Europe? None. There is no scenario where Nazi Germany gets defeated without the US supplies and invasion and the USSR leadership openly admitted exactly that privately.
Here's a map at the time of Normandy in 1944 (WW2 of course began in 1939):
https://omniatlas.com/assets/img/articles/complete/europe/eu...
Notice anything interesting? The Germans hadn't lost any territory in nearly five years of war.
The US was a liberator of Europe. It didn't keep half of Western Europe for itself. Do you know what the Soviets were by comparison? It was the 1,900,000 US soldiers, backed with US supplies and nukes (to stand off the Soviet conquerors in the East), that enabled Western Europe to become free after the war.
The USSR would not have even been able to keep its trains functioning without the US supplies. The US gave them nearly 2,000 locomotives.
It included 12,000+ airplanes. 1,911 steam locomotives, 66 diesel locomotives, 9,920 flat cars, 1,000 dump cars, 120 tank cars, and 35 heavy machinery cars. 400,000 jeeps and cargo trucks. 8,000 tractors. 12,000 armored vehicles, including 7,000 tanks. 35,000 motorcycles. 1.5 million blankets. 15 million pairs of boots. Four million tons of food supplies. And a vast amount of energy supplies.
Between Dec 1941 and August 1945, the allies consumed seven billion barrels of oil. The US supplied six billion of those barrels.
So the US kept the USSR in the war with its industry, while fighting two massive war fronts simultaneously in Europe and the Pacific.
https://en.wikipedia.org/wiki/Lend-Lease