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Thomas Jefferson becomes the 3rd president of U.S.
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Louisiana Purchase
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Lewis and Clark's expedition reaches the Pacific Ocean
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War of 1812
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U.S. acquires Florida under the Adams - Onis Treaty
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Congress passes Indian Removal Act
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Trail of Tears started
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Battle of the Alamo
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The United States annexes Texas
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Mexican - American war begins
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California Gold rush begins
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Abraham Lincoln is elected president
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Civil War begins
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President Lincoln is assassinated
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Civil war ends
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U.S. purchases Alaska from Russia
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President Garfield is assassinated
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USS Maine explodes
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Philippine - American War begins