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Period: to
Westward Expansion
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Louisiana Purchase
The Louisiana Purchase refers to the 530,000,000 acres of territory in North America that the United States purchased from France in 1803 for US $15 million. -
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. -
Adams-Onis Treaty
The Adams-Onís Treaty between the United States and Spain was negotiated by Secretary of State John Quincy Adams and the Spanish Minister to the United States, Don Luis de Onís, and signed in February 1819. The principal elements in the treaty were the acquisition of Florida by the United States and the establishment of a boundary line between Spanish territory and the United States. -
Texas Annexation
The people of Texas having, at the time of adopting their constitution, expressed by an almost unanimous vote, their desire to be incorporated into the Union. -
Mexican Cession
The Mexican Cession of 1848 is a historical name in the United States for the region of the modern day southwestern United States that Mexico ceded to the U.S. in the Treaty of Guadalupe Hidalgo in 1848, but had not been part of the areas east of the Rio Grande which had been claimed by the Republic. -
Oregon Territory (British)
Land claimed by both the United States and Great Britain. This was an ongoing dispute until the Treaty of 1846, which set the boundary at the 49th parallel, where it is today. -
Gadsen Purchase
The Gadsden Purchase is a 29,640-square-mile region of present-day southern Arizona and southwestern New Mexico that was purchased by the United States in a treaty signed by James Gadsden.
