In less than 50 years, the western border of United States grew from the Mississippi River to the Pacific Ocean, starting with the Louisiana Purchase and ending with the territories gained from Mexico in the Mexican-American War. Spain gave up its claim to Florida and the northeastern Gulf Coast, and agreements with Great Britain established the boundary with Canada by 1846.

Map by National Geographic Society

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Learn about the people and places key to the Battle of New Orleans, one of the last major battles of the War of 1812.

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