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Period: to
Westward Expansion
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Louisiana Purchase
The Louisiana Purchase was the acquisition by the United States of America in 1803 of 828,000 square miles of France's claim to the territory of Louisiana. -
British Cession
The Treaty secured control of Oregon territory, and marked the beginning of better relations between Britain and the U.S. It also paved the way for smooth relations between the U.S. and Canada. -
Adams-Onis
The Adams-Onis Treaty was one of the critical events that defined the U.S.-Mexico border. The border between the then-Spanish lands and American territory was a source of heated international debate. -
Texas Annexation
In 1845, the Republic of Texas voluntarily asked to become a part of the United States, and the government of the United States agreed to annex the nation. Mexican leaders had long warned the United States that if it tried to make Texas a state, it would declare war. The Republic of Texas included the present-day state of Texas, as well as portions of New Mexico, Kansas, Colorado, and Wyoming. -
Oregon Territory (Birtish)
The Territory of Oregon was an organized incorporated territory of the United States that existed from August 14, 1848, until February 14, 1859, when the southwestern portion of the territory was admitted to the Union as the State of Oregon. -
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 -
Gadsden 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
