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The United Kingdom, the Soviet Union, and the U.S. joined forces to defeat Nazi Germany for different reasons. The U.K. declared war on Germany in September 1939 after Germany (then allied with the Soviet Union) invaded the U.K. ally Poland. Germany on June 22, 1941, invaded the Soviet Union, breaking their alliance. After Pearl Harbor on December 7, 1941, the U.S. declared war on Japan, a German ally. Germany then declared war on the U.S., and the U.S. did likewise.

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