When the German army invaded Russia in June 1941, the United States' Lend-Lease system was already in place to aid friendly powers at war and thereby promote the defense of the U.S. Enacted so that the U.S. could lend war material to Britain, the system allowed the transfer of weapons, machinery, agricultural products, and other defense items. Although politically and practically difficult, Lend-Lease was also extended to the Soviets, and in Feeding...