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Louisiana Purchase
Acquisition of the territory of Louisiana by the United States from the French First Republic in 1803. In return for fifteen million dollars -
War of 1812
The War of 1812 was fought by the United States of America and its indigenous allies against the United Kingdom and its allies in British North America, with limited participation by Spain in Florida. It began when the United States declared war on 18 June 1812. -
The Adams–Onís Treaty
The Florida Purchase Treaty, or the Florida Treaty, 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 Mexico. -
Trail of Tears
The Trail of Tears was an ethnic cleansing and forced displacement of approximately 60,000 people of the "Five Civilized Tribes" -
Texas Revolution
The Texas Revolution was a rebellion of colonists from the United States and Tejanos in putting up armed resistance to the centralist government of Mexico. -
The Battle of The Alamo
The Battle of the Alamo was fought between the Republic of Texas and Mexico from February 23, 1836 to March 6, 1836. It took place at a fort in San Antonio, Texas called the Alamo. The Mexicans won the battle, killing all of the Texan soldiers inside the fort. -
Texas Annexation
The Texas annexation was the 1845 annexation of the Republic of Texas into the United States. Texas was admitted to the Union as the 28th state on December 29, 1845. -
Oregon Treaty
The Oregon Treaty is a treaty between the United Kingdom and the United States that was signed on June 15, 1846, in Washington, D.C. -
The Mexican-American War
Was an invasion of Mexico by the United States Army from 1846 to 1848. It followed the 1845 American annexation of Texas, which Mexico still considered its territory -
Mexican Cession
The Mexican Cession is the region in the modern-day southwestern United States that Mexico originally controlled, then ceded to the United States in the Treaty of Guadalupe Hidalgo in 1848 after the Mexican–American War -
The Gold Rush
The California Gold Rush was a gold rush that began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California from the rest of the United States and abroad -
Sand Creek Massacre
The Sand Creek massacre was a massacre of Cheyenne and Arapaho people by the U.S. Army in the American Indian Wars -
Wounded Knee Massacre
The Wounded Knee Massacre, also known as the Battle of Wounded Knee, was a massacre of nearly three hundred Lakota people by soldiers of the United States Army.