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1492
Discovery of America by Columbus
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Settlement of Jamestown
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The French and Indian War
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Boston Tea Party
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Battle of Lexington and Concord
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Declaration of Independence
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Battle of Yorktown
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Constitutional Convention
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Invention of the cotton gin
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Alien and Sedition Acts
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Louisiana Purchase
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War of 1812
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Missouri Compromise
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Andrew Jackson's Election
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Trail of Tears
Between 1830 and 1850, as it wasn't a one-time event. -
Invention of the telegraph
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Panic of 1837
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Mexican-American War
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Compromise of 1850
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The Firing on Fort Sumter
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The Emancipation Proclamation
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The Organization of The Standard Oil Trust
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Abraham Lincoln Assassination
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Surrender at Appomattox Court House
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Andrew Johnson's Impeachment
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13th, 14th, 15th Amendments.
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Pullman and Homestead Strikes
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The Spanish-American War
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Theodore Roosevelt Becomes President
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The invention of the electric light, the telephone, and the airplane