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The United States purchased 828,000 square miles of France's claim to the territory of Louisiana.
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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.
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The Adams-Onis Treaty granted the U.S. Florida
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The Texas Republic's president formally transferred power to the new governor of the U.S. state of Texas.
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The Senate, preoccupied with war against Mexico, quickly approved the Oregon Treaty with Britain, setting the boundary at the 49th parallel.
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The region of current southwest America that Mexico ceded to the U.S.
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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.
