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Period: to
Westward Expansion
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Louisiana Purchase
In this transaction with France, this was signed on April 30, 1803, the United States purchased 828,000 square miles of land west of the Mississippi River for $15 million. -
British Cession
The Treaty of 1818 described the boundary between British North America and the US as a line from the farthest northwest point of the Lake of the Woods. -
Adams Onis
This treaty was signed in Washington, on February 22, 1819, by John Quincy Adams, U.S. Secretary of State, Luis de Onís, and the Spanish minister. -
Texas Annexation
Both Congress and the convention voted for the annexation. A state constitution, drawn up by the convention, was ratified by popular vote in October 1845 and accepted by the United States Congress on December 29, 1845. -
Mexican Cession
In February of 1848, Mexico and the United States signed the Treaty of Guadalupe-Hidalgo. The treaty recognized Texas as a U.S. state, and ceded a large portion of land about half the area that belonged to the Mexican republic, for the cost of $15 million. -
Oregon Territory
This treaty was signed on June 15, of 1846. This Treaty set the U.S. and the British North American border at the 49th parallel with the exception of Vancouver Island, which was retained in its entirety by the British. -
Gadsden Purchase
There was a Meeting in Mexico City on December 30, 1853, James Gadsden, U.S. Minister of Mexico, and General Antonio López de Santa Anna, president of Mexico, signed the Gadsden Purchase.
