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The Louisiana Purchase was the acquisition by the United States of America in 1803 of 828,000 square miles of France's claim to the territory of Louisiana.
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Today in History, 20 October 1818: Under Monroe’s first term as president, Britain and the U.S. signed the Treaty of 1818, which established the boundary between U.S. and Canadian territories at the 49th parallel.
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The Adams–Onís Treaty of 1819, also known as the Transcontinental Treaty or the Purchase of Florida, or the Florida Treaty, was a treaty between the United States and Spain in 1819 that gave West Florida to the U.S. and set out a boundary between the U.S. and New Spain (now Mexico).
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The Texas annexation was the 1845 incorporation into the United States of America of the Republic of Texas, which was admitted to the Union as the 28th state.
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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. 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.
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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.
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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 by James Gadsden.
