What conflict marked the last time the U.S.Congress officially declared war?

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The last time the U.S. Congress officially declared war was during World War II, on December 8, 1941, the day after the Japanese attack on Pearl Harbor. Since then, the U.S. has engaged in several military conflicts under different legal justifications, such as the Authorization for Use of Military Force (AUMF), but without an official declaration of war by Congress.

What Conflict Marked the Last Time the U