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Louisiana Purchase
Largest land acquisition in US history, doubled the size of the US.
Adams-Onis Treaty
Spain ceded Florida to the United States in 1819.
Texas Republic
Texas became a separate Republic in 1836 after rebelling against Mexico.
Treaty of Guadalupe Hidalgo
Ended the Mexican War in 1848, ceded California, New Mexico, and Utah Territories to the U.S.
Gadsden Purchase
Last US land purchase, acquired land from Mexico for $15 million.
Alaska Purchase
U.S. bought Alaska from Russia, annexed due to the discovery of gold.
Platt Amendment
Established a civil government in Puerto Rico after the Spanish-American War, granted citizenship to Puerto Ricans in 1917.
Treaty of Paris (1898)
Spain ceded Guam and the Philippines to the United States in return for $20 million.
Hawaiian Annexation
Hawaii became a U.S. territory in 1900, citizens became U.S. citizens, and it later became the 50th state.
Panama Canal Zone
Territory in Central Panama governed by the U.S. for the operation of the Panama Canal under the Hay-Bunau-Varilla Treaty.
