Germany invades the Soviet Union without a declaration of war.
Allied troops create supply lines through Iran to get the Soviet Union supplies.
Soviet troops are pushed back into the interior of the country.
The war drags on longer than the Germans expected; they are forced to fight in the winter which is bitterly cold.
The Germans are forced to retreat. (History repeating itself—the same thing happened with Napolean's French army!)
Joseph Stalin orders that Stalingrad (his namesake city) must not fall, and Soviet troops defend the city fiercely.
German troops are forced to surrender on Feb. 2, 1943.
So much of Germany's focus is on the Soviet Union that the allied forces have victories in other areas, which helps to end World War II.
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