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The U.S. Congress last exercised its power to declare war between December, 1941 and June, 1942 during the advent of America's involvement is World War II. It has not been used since, which means that all U.S. military action since then has been unconstitutional.

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10y ago
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14y ago

June 5, 1942 with Hungary, Romania, and Bulgaria during World War II

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Q: When was the last time congress exercised its constitutional power to declare war?
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