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Benedict Arnold turned traitor to the American cause during the Revolutionary War, first by beginning secret communications with the British in 1779 and later by plotting to surrender West Point to them in 1780
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the USS Constitution, under Captain Isaac Hull, decisively defeated the British frigate HMS Guerriere, commanded by Captain James Richard Dacres. The battle, fought southeast of Halifax, Nova Scotia, resulted in the Guerriere being crippled and surrendering
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Mexico lost California, New Mexico, Arizona, and other territories to the United States at the end of the Mexican-American War (1846–1848) under the Treaty of Guadalupe Hidalgo
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the decisive naval engagement in the Philippines during the Spanish-American War, where the U.S. Navy under Commodore George Dewey destroyed the Spanish Pacific Squadron, effectively ending Spanish colonial rule