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In this transaction with France, signed on April 30, 1803, the United States purchased 828,000 square miles of land west of the Mississippi River for $15 million.
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The Treaty of 1818 described the boundary between British North America and the US as a line from the farthest northwest point of Lake of the Woods "north or south
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The treaty was signed at Washington, on February 22, 1819, by John Quincy Adams, U.S. Secretary of State, and Luis de Onís, Spanish minister.
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Both Congress and the convention voted for 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, the date of Texas's legal entry into the Union.
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The treaty was signed on June 15, 1846. The Oregon Treaty set the U.S. and British North American border at the 49th parallel with the exception of Vancouver Island, which was retained in its entirety by the British.
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In February 1848, the two countries signed the Treaty of Guadalupe-Hidalgo. The treaty recognized Texas as a U.S. state, and ceded a large chunk of land — about half the area that belonged to the Mexican republic — to the United States for the cost of $15 million.
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Meeting in Mexico City on December 30, 1853, James Gadsden, U.S. Minister to Mexico, and General Antonio López de Santa Anna, president of Mexico, signed the Gadsden Purchase.
