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Thomas Jefferson authorized the purchase of the land. The treaty was dated April 30, and signed May 2.
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This is the period of time when the U.S. started exploring and settling in the western regions.
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This was the treaty where the U.S. got Florida from Spain.
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This is when Texas was accepted in to the Union.
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This was when the treaty was signed between the U.K. and the U.S.
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This is when the treaty ending the Mexican-American War was signed. It also gave America a new area of land that would become part of present day California, Nevada, Texas, Arizona, Utah, and New Mexico.
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On this day, James Gadsden presented the modified treaty to the Mexican president, Antonio de Santa Anna. It was then signed by Santa Anna.
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Westward Expansion ended when Arizona was admitted into the Union as the last of the 48 contiguos states.