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Thomas Jefferson commissioned the Lousiana Purchase, paying 15 million dollars to France with the Lousiana Purchase Treaty.
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SIgned Feburary 22, 1819, but not ratified until Feburary 19, 1821, and costing up to 5 million dollars is what it took to abtain Florida from the Spanish.
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In short, John Tyler did everything to make the purchase happen, but his presidencey ended before he could sign it, so James Polk signed it. The United States payed 15 million dollars to Mexico through the Treaty of Guadalupe Hidalgo.
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General Winfield Scott payed 15 million dollars to Mexico through the Treaty of Guadalupe Hidalgo, which obtained land in states including California, Arizona, Nevada, Utah, Colorado, and New Mexico.
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The United States got the Oregon Territory by threating Great Britian with military forces. The deal ended with the Oregon Treaty.
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James Gadsden payed 10 million dollars to Mexico for the 29,640 square miles of land. The United States made this purchase so they could make a transcontinental railroad.
