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Thomas Jefferson takes office as the Third President of the United States
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Thomas Jefferson purchases the Louisiana Territory from France for fifteen million dollars, doubling the size of the United States.
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The War of 1812 was a conflict between the U.S. and Great Britain over British violations of U.S. maritime rights.
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The Missouri Compromise admitted Missouri to the union as a slave state and also admitted Maine to the union as a free state. It also banned slavery from the remaining Louisiana Purchase territory above the 36º 30' parallel.
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President Jackson signs the Indian Removal Act into law, allowing the government to force Native Americans west of the Mississippi River.
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The Mexican-American War started over a territorial dispute in Texas over the land between the Rio Grande River and the Nueces River. As a result of the war, Mexico lost half its territory after the United States purchased the land.
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Abraham Lincoln is inaugurated as the sixteenth President of the United States after winning the election of 1860.
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The Civil War is one of the most infamous wars that the U.S. has fought. The Civil War was a conflict between the Northern and Southern states in order to determine the fate of slavery in the United States.
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Abraham Lincoln issues the Emancipation Proclamation, declaring that any and all slaves in any state are henceforth freed.
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President Abraham Lincoln is assassinated by John Wilkes Booth at Ford's Theater.