I think it's too simplistic to tell who contributed the most. The victory was the result of allies' cooperation. Without the land lease, USSR was unlikely to wi

I think it's too simplistic to tell who contributed the most. The victory was the result of allies' cooperation. Without the land lease, USSR was unlikely to withstand German invasion. Without USSR on the Eastern front, US and UK forces were unlikely to land in Normandy, and in such a case such an operation would be much less efficient if ever possible. Other countries also played important parts in the war. If we consider the contribution in terms of casualties, USSR had the most, after which comes China, Poland, etc. See https://en.wikipedia.org/wiki/World_War_II_casualties#Human_losses_by_country https://en.wikipedia.org/wiki/World_War_II_casualties#Human_...