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Louisiana Purchase
a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million. Thomas Jefferson commissioned the Corps of Discovery Expedition, led by Meriwether Lewis and William Clark, to explore the territory acquired in the Louisiana Purchase. -
Adams-Onis Treaty
The Adams–Onís Treaty of 1819 was a treaty between the United States and Spain in 1819 that ceded Florida to the U.S. and defined the boundary between the U.S. and New Spain. -
"Remember the Alamo" (Battle of the Alamo)
The Battle of the Alamo was a pivotal event in the Texas Revolution. Following a 13-day siege, Mexican troops under President General Antonio López de Santa Anna launched an assault on the Alamo Mission near San Antonio de Béxar (modern-day San Antonio, Texas, United States), killing all of the Texian defenders -
Webster-Ashburton treaty
A treaty resolving several border issues between the United States and the British North American colonies. It resolved the Aroostook War, a nonviolent dispute over the location of the Maine–New Brunswick border. -
Texas Annexation
The Texas annexation was the 1845 incorporation of the Republic of Texas into the United States of America, which was admitted to the Union as the 28th state. -
War with Mexico
The Mexican-American War (1846-1848) marked the first U.S. armed conflict chiefly fought on foreign soil The Rio Grande is one of the principal rivers in the southwest United States and northern Mexico -
Fifty-four forty or fight
Polk called for expansion that included Texas, California, and the entire Oregon territory. The northern boundary of Oregon was the latitude line of 54 degrees, 40 minutes. "Fifty-four forty or fight!" was the popular slogan that led Polk to victory against all odds. -
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. -
Treaty of Guadalupe-Hidalgo
The Treaty of Guadalupe Hidalgo officially entitled the Treaty of Peace, Friendship, Limits and Settlement between the United States of America and the Mexican Republic -
Oregon Territory
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. -
Zachary Taylor
Zachary Taylor was the 12th President of the United States, serving from March 1849 until his death in July 1850. -
Winfield Scott
Winfield Scott was a United States Army general, and unsuccessful presidential candidate of the Whig Party in 1852 -
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 on December 30, 1853 -
President Polk
James Knox Polk was the 11th President of the United States