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The United States began providing military aid to the Soviet Union in September 1940. The Lend-Lease Act of 1941 allowed the US to lend or lease war supplies to any country deemed vital to the defense of the US. The Soviet Union was declared eligible for lend-lease aid on November 7, 1941.
From 1941 through 1945, the US sent $11.3 billion in goods and services to the Soviets. The aid was critical in helping the Soviets withstand the Nazi onslaught. By the end of 1942, the Nazi advance into the Soviet Union had stalled. It was finally reversed at the battle of Stalingrad in 1943.
The first aid goods from the United States to the Soviet Union under the Lend-Lease program arrived in the Soviet port of Arkhangelsk (also known as Archangel) on August 31, 1941. These supplies included aircraft, trucks, and other military equipment, and they were crucial in bolstering the Soviet war effort against Nazi Germany during World War II.