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Lousiana Purchase
A land dal between the United States and France, I which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi for $15 million -
Red River Cession
The United States signed the Convention of 1818 with Great Britain in order to settle some issues left open by the Treaty of Ghent, which four years earlier had ended the War of 1812 -
Florida Annexation
Land gained from the Adams-Onis Treaty. A treaty between the U.S. and Spain that ceded Florida and defined the boundary between the U.S. and New Spain -
Webster Ashburn Treaty
A treaty resolving several border issues between the U.S. and British North American Colonies, signed under John Tyler's presidency,it resolved the Aroostook war, a nonviolent dispute over the location of the Maine- New Brunswick border. -
Texas Annexation
the 1845 incorporation of the Republic of Texas into the United States of America, which was admitted to the Union as the 28th state. -
Oregon Territory
boundary dispute between the U.S. and Britain was settled with the signing of the Oregon Treaty. The British gained sole possession of the land north of the 49th parallel and all of Vancouver Island, with the United States receiving the territory south of that line -
Mexican Cession
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 of Texas, though the Texas annexation resolution two years earlier had not specified Texas's southern and western boundary -
Gadsen Purchase
was an agreement between the United States and Mexico, finalized in 1854, in which the United States agreed to pay Mexico $10 million for a 29,670 square mile portion of Mexico that later became part of Arizona and New Mexico