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Period: to
Westward Expansion
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Louisiana Purchase
The Louisiana Purchase was the United States claim to all or parts of fifteen states and two Canadian provinces; all of Arkansas, Missouri, Iowa, Oklahoma, Kansas, and Nebraska, parts of Minnesota, most of North and South Dakota, northern portions of New Mexico and Texas, portions of Montana, Wyoming, Colorado, Louisiana and New Orleans, and parts of the Canadian provinces Alberta and Saskatchewan. -
British Cession
As a result of the Treaty of 1818, the United States and the United Kingdom agreed to a boundary line. The British ceded all of Rupert's Land south of the 49th parallel and west of the Rocky Mountains and the Red River Colony south of that lattitude. The United States ceded the northernmost tip of Louisiana Territory. -
Adams-Onis
Also known as the Transcontinental Treaty or the Florida Treaty, The Adams-Onis Treaty was a treaty between the United States and Spain. The treaty gave West Florida to the United States and set out a boundary between the United States and New Spain. The treaty settled the border dispute between the two countries. -
Texas Annexation
After declaring independence from the Republic of Mexico in 1836, a vast amount of Texans favored the annexation. Texas had become the 28th states in the United States. Democrats and Whigs, however, opposed introducing Texas to the United States due to the fact that Texas was a large slave-holding state. The bill to annex Texas was signed on the 29th of December, 1845, but Texas formally relinquished its sovereignty to the United States on February 19, 1846. -
Mexican Cession
During the Mexican Cession, Mexico ceded to the United States in the Treaty of Guadalupe Hidalgo. The Mexico Cession was 14.9% of the current United States. Mexico lost 55% of its pre-1836 territory due to the Treaty of Guadalupe Hidalgo. -
Oregon Territory (British)
In 1846, the region originally claimed by many countries was split between the United States and Great Britain. The region included the current states of Oregon, Washington, and Idaho, along with parts of Wyoming and Montana. The dispute between the United States and Britain over the boundaries was resolved with the Treaty of Oregon. Britain gained the land north of the 49th parallel, while the United States gained the land south of the border. On February 14, 1859, Oregon entered the Union. -
Gadsden Purchase
The Gadsden Purchase is a 29,640-square-mile region of present-day southern Arizona and southwestern New Mexico. The treaty was signed by James Gadsden. The United States gained lands south of the Gila River and west of the Rio Grande. The United States planned on building a transcontinental railroad on the new land.
