1800 was a common year starting on Wednesday (see link for calendar).
Events
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March 14 - Cardinal Barnaba Chiaramonti is elected pope Pius VII.
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March 21 - Pius VII becomes Pope
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April 24 - US Library of Congress founded.
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May 5 - Great Britain passes the Act of Union to join Great Britain and Ireland into the United Kingdom to take effect on 1 January 1801. The act is signed by King George III in August.
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May 15 - Napoleon Bonaparte crosses the Alps and invades Italy.
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June 14 - Battle of Marengo, Napoleon defeats the Austrian troops near Marengo, Italy .
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June 2 - First smallpox vaccination in North America, at Trinity, Newfoundland .
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June 27 - Pascha Jussuf Karamanli of Tripoli declares war on Sweden by having the flagpole on the consulate chopped down.
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September 5 - The island of Malta, that was occupied by the French, is conquered by British troops.
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November 1 - US President John Adams becomes the first President of the United States to live in the Executive Mansion (later renamed the White House).
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November 17 - The U.S. Congress holds its first Washington, DC session.
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December 3 - Battle of Hohenlinden, the French army defeats the Austrian troops.
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December 24 - An assault on Napoleon Bonaparte fails in Paris.
- Invention of the voltaic pile by Alessandro Volta: the first chemical battery
- The infrared radiation is discovered by Wilhelm Herschel.
- The Althing of Iceland, the world's oldest parliament, is abolished.
Ongoing events
Births
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January 7 - Millard Fillmore, 13th President of the United States 1850-1853
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February 9 - Hyrum Smith, American religious leader (d. 1844)
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February 11 - William Henry Fox Talbot, English photographic pioneer
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March 15 - Heinrich von Dechsen, geologist and mineralogist (d. 1889)
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May 9 - John Brown, American abolitionist (d. 1859)
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June 23 - Karol Marcinkowski, Polish physician and social activist (d. 1846)
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July 31 - Friedrich Wöhler, German chemist
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August 22 - William S. Harney, US general
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October 2 - Nat Turner, leader of a slave rebellion
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December 3 - France Prešeren , Slovenian poet
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Charles Goodyear, American rubber magnate
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Emperor Ninko of Japan
Deaths