The Allies secured victory in World War II when Germany was overwhelmed by the strength of the Soviet Red Army, aid from the United States and the strategy of the United States Air Force. The war ended with the surrender of Germany on May 7, 1945.
The Soviet Red Army improved their training regimen, and utilized more advanced technology to outmatch the Germans. The Soviet Union's emergency war economy produced armaments for the army, and the United States and Great Britain also provided aid to the Soviet troops, sending food, boots, telephone wire and trucks. The United States Air Force used intelligent bombing strategies against Germany and Japan, and when combined with Britain's air power, the German Air Force was no match. Germany was forced to use its air power as defense rather than offense. Many aircraft were destroyed, and the German transport of supplies was interrupted.