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In World War I, the US declared war on April 6, 1917.

In World War II, the US declared war on Germany on December 11, 1941. The US declared war on Japan on December 8, 1941 (the day after Japan attacked the US at Pearl Harbor); Nazi Germany was allied with Japan and declared war on the US on December 11, and the US returned the favor, so to speak.

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12y ago

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