Mexican Cession - 1848 - Lands surrendered by Mexico after the U.S.-Mexican War and the signing of the Treaty of Guadalupe-Hidalgo, Texas Annexation - 1845 - The Republic of Texas is annexed as the 28th state, Florida - 1819 - Acquired from Spain with the signing of the Adams-Onis Treaty, Oregon Territory - 1846 - Land acquired through a compromise with the Britain , Louisiana Purchase - 1803 - Territory purchased from France that doubled the size of the United States , Gadsden Purchase - 1854 - Purchased from Mexico to complete the Transcontinental Railroad, Original Thirteen States - 1776 - Declared Independence from Britain , The United States in 1783 - 1783 - British territory surrendered after the American Revolution with the signing of the Treaty of Paris,

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