U.S. Territorial Expansion

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13 Colonies

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Established by Great Britain; gained by the U.S. following the American Revolution

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Treaty of Paris 1783

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Gained by the U.S. following the American Revolution; new border was the Mississippi River

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Louisiana Purchase 1803

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Purchased by Thomas Jefferson; doubled the size of the U.S.

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Florida 1819

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Purchased by John Quincy Adams from Spain.

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Texas 1845

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Annexed after the territory gained Independence from Mexico; fought a war over the border with Mexico.

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Oregon Territory 1846

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Finalized after a decision between the U.S. and Great Britain for the Northern border of the U.S.

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Mexican Cession 1848

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U.S. offered to purchase this area, Mexico declined; territory gained from the U.S. - Mexican War.

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Gadsden Purchase 1853

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Last purchase made by the U.S.; purchased to finish Southern railroad.