There was also the little matter of a huge number of Studebaker trucks which were built on an America-created assembly line in Iran from parts manufactured in the US and shipped to Iran. They were initially shipped assembled, but that required far more scarce ship transport than the parts, which could be shipped so much more compactly.Each truck was loaded with materiel needed by the USSR, and the keys were turned over to Soviet Army drivers who would travel in convoys through Iran to their destinations. After unloading, the trucks provided the Red Army infantry with vitally needed mobility.
When I hear people say the war couldn’t have been won without the Soviets, I think it is even more true to say the war couldn’t have been won without the USA.