The Red Army was supplied via trucks made in Detroit and pork raised in Iowa. The logistics support we gave the Russians was simply incredible.
Lend Lease to Russia
From Major Jordan’ Diaries
http://www.jrbooksonline.com/fdr-scandal-page/lend.html
Yes, giving war materiel to the USSR was our primary contribution to the defeat of the Nazis.
The US in WW2 mostly fought in the Pacific against Japan. By the time we landed in Europe it was a mop-up operation; the Soviets had already cleaned the Germans out of almost all of Eastern Europe and had even crossed the border of Germany proper, before a single Western soldier landed on the continent.
Lend Lease