The United States Declared War on Britain
On this day · 18 June 1812
On June 18, 1812, the young American republic took the unprecedented step of formally declaring war on the world's leading naval power.
On June 18, 1812, President James Madison signed Congress’s war measures into law, launching the War of 1812 against Great Britain. It was the first time the United States had formally declared war under its new Constitution.
The decision was deeply contested. The House voted 79 to 49 in favor, and the Senate narrowly concurred 19 to 13 — splitting along strict party lines, with Democratic-Republicans backing the war and Federalists opposed. Madison’s grievances centered on Britain’s interference with American trade and the Royal Navy’s practice of impressing U.S. sailors on the high seas.
“Whereas the Congress of the United States… have declared by their act bearing date the 18th day of the present month that war exists…”
The conflict that followed would see Washington burned, the writing of The Star-Spangled Banner, and a fragile peace by 1815 — yet it remains the closest war vote in American history.
Sources & references
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