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President Thomas Jefferson bought it from France for 3 cents an acre
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The Adams-onis Treaty admitted Florida to the United States
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On April 4, 1842, British diplomat Lord Ashburton arrived in Washington at the head of a special mission to the United States. The first order of business was settling the border between the United States and Canada.
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Texas Republic's president formally transferred power to the new governor of the U.S. state of Texas.
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The Senate ratified the treaty by a vote of 41-14 on June 18, 1846. A later controversy over the precise boundaries in the Juan de Fuca Strait was resolved by international arbitration in favor of the United States.
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The Mexican Cession consist of present day U.S. states of California, Nevada, Utah, most of Arizona, about half of New Mexico, about a quarter of Colorado, and a small section of Wyoming.
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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.
