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| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
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| 1812 by topic |
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| Arts, history, and science |
| Countries |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
1812 (MDCCCXII) was a leap year starting on Wednesday in the Gregorian calendar and a leap year starting on Monday in the Julian calendar.
Events
- March 5 – Prussia and France sign the Treaty of Paris
- March 26 – The 1812 Caracas earthquake destroys Caracas in Venezuela.
- April 30 – Louisiana is admitted as the 18th U.S. state.
- June 18 – The War of 1812 between the United States, Canada and the United Kingdom begins.
- December 30 – Convention of Tauroggen is signed.
- The capital of Finland is moved from Turku to Helsinki.
Births
- for more information, see Category:1812 births.
Deaths
- for more information, see Category:1812 deaths.