Final answer:
The United States fought in World War II against the Axis powers with Britain and the Soviet Union as allies, following the attack on Pearl Harbor.
Explanation:
The United States fought with Britain and the Soviet Union against the German Nazi threat in Europe during World War II. The entry of the United States into the war was primarily triggered by the Japanese attack on Pearl Harbor on December 7, 1941, which led to the U.S. declaring war on Japan and its allies.
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