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Period: to
Westward Expansion
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Louisiana Purchase
The United States purchased 828,000 square miles of France's claim to the territory of Louisiana. -
British Cession
Under Monroe’s first term as president, Britain and the U.S. signed the Treaty of 1818, which established the boundary between U.S. and Canadian territories at the 49th parallel. -
Purchase of Florida
The Adams-Onis Treaty granted the U.S. Florida -
Annexation of Texas
The Texas Republic's president formally transferred power to the new governor of the U.S. state of Texas. -
Oregon Territory
The Senate, preoccupied with war against Mexico, quickly approved the Oregon Treaty with Britain, setting the boundary at the 49th parallel. -
Mexican Cession
The region of current southwest America that Mexico ceded to the U.S. -
Gadsden Purchase
The United States agreed to pay Mexico $10 million for a 29,670 square mile portion of Mexico that later became part of Arizona and New Mexico.
