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On April 24, 1800, the United States Library of Congress is founded.
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On February 17, 1801, Thomas Jefferson is elected as the 3rd president of the United States.
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On May 10, 1801, Tripoli declares war against the United States.
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On May 22, 1802, Martha Washington passes.
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On March 1, 1803, Ohio is admitted to the Union as the 17th U.S. state.
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On April 30, 1803, President Thomas Jefferson purchases the Louisiana Territory from Napoleon's France.
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On May 14, 1804, ordered by Thomas Jefferson, Lewis and Clark begin their expedition.
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On July 11, 1804, a duel between Alexander Hamilton and Vice President Aaron Burr results in the death of Hamilton.
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On February 17, 1807, Vice President Aaron Burr is arrested for treason in Alabama.
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On September 1, 1807, Vice President Aaron Burr is acquitted of treason.
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On April 6, 1808, the American Fur Company is incorporated by John Jacob Astor.
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On December 7, 1808, James Madison was elected as the 4th President of the United States.
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On March 4, 1809, James Madison was inaugurated.
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On June 23, 1810, the Pacific Fur Company is formed by John Jacob Astor.
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On November 7, 1811, at the battle of Tippecanoe, Indian warriors are defeated by William Henry Harrison.
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On August 13, 1812, August naval battles in the War of 1812 begin with the United States Navy defeating the British.
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On April 27, 1813, the Battle of York is held when American troops raid and destroy, but do not occupy the city.
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On June 6, 1813, Americans lose the Battle of Stoney Creek to a British army.
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On September 10, 1813, the Battle of Lake Erie is won by the American navy.
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On October 5, 1813, a United States victory at the Battle of Thames.
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On August 24, 1814, The White House is burned by the British during the War of 1812.
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On September 11, 1814, the Battle of Lake Champlain is won by U.S. naval forces.
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On December 24, 1814, a peace treaty is signed, bringing an end to the War of 1812.
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On August 9, 1823 - Arikara Indian War begins.
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On March 4, 1825, John Quincy Adams is inaugurated as President.
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On March 4, 1829, Andrew Jackson is inaugurated as President.
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On July 23, 1829, William Austin Burt invents and patents the typewriter.
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On April 8, 1832, the Black Hawk War begins
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On February 23, 1836, the battle for the Alamo is waged in San Antonio, Texas.
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On April 21, 1836, the battle of San Jacinto is waged with Sam Houston leading the Texas army to victory.
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On March 4, 1837, Martin Van Buren is inaugurated as president.
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On May 8, 1846, the first major conflict of the Mexican War occurs. War is declared by the United States against Mexico on May 13, backed by southerners while northern Whigs were in opposition. Ten days later, Mexico declares war back.
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On September 8, 1847, the Battle for Mexico City is fought
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On February 2, 1848, the Treaty of Guadalupe Hidalgo ended the Mexican War
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On March 4, 1857, James Buchanan is sworn into office as the 15th President of the United States.
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On March 4, 1861, Abraham Lincoln is sworn in as president of the United States.
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On July 21, 1861, the first Battle of Bull Run at Manassas, Virginia occurs.
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On September 22, 1862, Abraham Lincoln issues the preliminary Emancipation Proclamation
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On April 14, 1865, Abraham Lincoln is assassinated in Ford's Theatre, Washington, D.C..
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On December 18, 1865, the Thirteenth Amendment, abolishing slavery, takes effect.
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On November 27, 1868 - The Battle of the Washita River ends.
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On March 1, 1875, the Civil Rights Act is passed by the United States Congress.
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On June 25, 1876, the Battle of Little Big Horn occurs.
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On August 2, 1876, legislation is approved for the federal government to complete the Washington Monument.