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Period: to
Westward Expansion
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Louisiana Purchase
Thomas Jefferson purchased the Lousiana Purchase from France. The territory was purchased for $15 million, which doubled the United States land. -
British Cession
The British Ciession, or Treaty of 1818, was a treaty signed in 1818 between the United States and the United Kingdom. It resolved standing boundary issues between the two nations, and allowed for joint occupation and settlement of the Oregon Country, known to the British and in Canadian history as the Columbia District of the Hudson's Bay Company, and including the southern portion of its sister district New Caledonia. -
Adams- Onis Treaty
The treaty was named for John Quincy Adams of the United States and Louis de Onís of Spain and renounced any claim of the United States to Texas. It fixed the western boundary of the Louisiana Purchase as beginning at the mouth of the Sabine River and running along its south and west bank to the thirty-second parallel and thence directly north to the Río Rojo (Red River). -
Texas Annexation
This purchase was adding the Republic of Texas, which was admitted to the Union as the 28th state. Also, this was signed by President Polk. -
Mexican Cession
After the U.S. cavalry ignored an order from the Mexican army to retreat to the Nueces River and instead advanced south to the Rio Grande, fighting broke out. Three weeks later, Congress declared war on Mexico. After that, fighting continued for more than a year, and ended in September 1847. 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 -
Oregon Territory (British)
The territory, when the southwestern portion of the territory was admitted to the Union as the State of Oregon, was then divided between the U.S. and Britian in 1846, then the problem was resolved when Corvallis came back and declared it the United States. -
Gadsden Purchase
The purchase was 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, the American ambassador to Mexico at the time.
