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The five wars that were officially declared by the United States Congress are the War of 1812 against Great Britain, the Mexican-American War in 1846, the Spanish-American War in 1898, World War I in 1917, and World War II in 1941. Each of these conflicts involved formal declarations that authorized military action against other nations. Since World War II, the U.S. has engaged in numerous military actions without formal declarations of war.

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