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Thomas Jefferson is elected 3rd president of America
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Louisiana Purchase
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Zebulon Pike explores Arkansas River
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The Treaty of Ghent
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Purchase of Florida
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Missouri Compromise
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Mexico gains independence from Spain
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Trail of Tears
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Santa Anna is elected President of Mexico
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Treaty of Guadalupe Hidalgo ends the Mexican-American War
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Annexation of Texas
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Oregon Territory
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Mexican Cession (War with Mexico)
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California Gold Rush
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The Gadsden Purchase
