Editing 1804 (section)

=== January–March ===
* [[January 1]] – [[Haiti]] gains independence from France, and becomes the first black republic.
* [[February 4]] – The [[Sokoto Caliphate]] is founded in West Africa.
* [[February 14]] – The [[First Serbian uprising]] begins the [[Serbian Revolution]]. By 1817, the [[Principality of Serbia]] will have proclaimed self-rule from the [[Ottoman Empire]], the first nation-state in Europe to do so.
* [[February 15]] – [[New Jersey]] becomes the last of the northern United States to abolish [[History of slavery in New Jersey|slavery]].
* [[February 16]] – [[First Barbary War]]: [[Stephen Decatur]] leads a raid to burn the pirate-held frigate {{USS|Philadelphia|1799|6}} at [[Tripoli, Libya|Tripoli]] to deny her further use by the captors.
* [[February 18]] – [[Ohio University]] is chartered by the Ohio General Assembly.
* [[February 20]] – [[Hobart]] is established in its permanent location in [[Van Diemen's Land]] (modern-day Tasmania) as a British [[penal colony]].<ref>{{cite news|url=http://nla.gov.au/nla.news-article27194837|title=Queen to Honour David Collins in Historic Unveiling|newspaper=[[The Mercury (Hobart)|The Mercury]]|location=Hobart|date=19 February 1954|page=8, ''Royal Visit Souvenir'' supplement|access-date=2012-01-17|archive-date=2019-01-07|archive-url=https://web.archive.org/web/20190107070354/http://nla.gov.au/nla.news-article27194837%20|url-status=live}}</ref>
* [[February 21]] – [[Cornwall|Cornishman]] [[Richard Trevithick]]'s newly built ''Penydarren'' [[steam locomotive]] operates on the [[Merthyr Tramroad]], between [[Penydarren]] in [[Merthyr Tydfil]] and [[Abercynon]] in [[South Wales]], following several trials since February 13, the world's first locomotive to work on rails.<ref>{{cite book|last=Rattenbury|first=Gordon|author2=Lewis, M. J. T.|title=Merthyr Tydfil Tramroads and their Locomotives|year=2004|publisher=[[Railway and Canal Historical Society]]|location=Oxford|isbn=0-901461-52-0}}</ref>
* [[February 22]]–[[April 22]] – [[1804 Haiti massacre]], an ethnic cleansing with the goal of eradicating the white population on Haiti.<ref>{{cite book|first=Julia|last=Gaffield|title=Haitian Connections in the Atlantic World: Recognition after Revolution|publisher=University of North Carolina Press|location=Chapel Hill|year=2015|pages=83–84}}</ref>
* [[March 4]]–[[March 5]] – The [[Castle Hill convict rebellion]] breaks out in [[New South Wales]], led by Irish [[convicts in Australia]].<ref>{{cite web|title=Castle Hill convict rebellion 1804|url=http://www.dictionaryofsydney.org/entry/castle_hill_convict_rebellion_1804|first=Anne-Maree|last=Whitaker|work=Dictionary of Sydney|access-date=March 3, 2013|archive-url=https://web.archive.org/web/20180304231534/https://dictionaryofsydney.org/entry/castle_hill_convict_rebellion_1804|archive-date=March 4, 2018|url-status=live}}</ref>
* [[March 7]] – In Britain:
** [[John Wedgwood (horticulturist)|John Wedgwood]] founds the [[Royal Horticultural Society]].<ref name="Pocket On This Day">{{cite book|title=Penguin Pocket On This Day|publisher=Penguin Reference Library|isbn=0-14-102715-0|year=2006}}</ref>
** [[Thomas Charles]] is instrumental in founding the [[British and Foreign Bible Society]].<ref>{{cite web|url=http://www.biblesociety.org.uk/about-bible-society/history/our-timeline/|title=Our timeline|publisher=Bible Society|access-date=November 26, 2010|archive-url=https://web.archive.org/web/20101228224810/http://www.biblesociety.org.uk/about-bible-society/history/our-timeline/|archive-date=December 28, 2010|url-status=dead}}</ref>
* [[March 10]] – [[Louisiana Purchase]], [[Three Flags Day]]: In [[St. Louis]], a formal ceremony is conducted to transfer ownership of [[Louisiana Territory]] from France to the United States.
* [[March 17]] – [[Friedrich Schiller]]'s play ''[[William Tell (play)|Wilhelm Tell]]'' is first performed at [[Weimar]], under the direction of [[Johann Wolfgang von Goethe]].
* [[March 21]] – The [[Napoleonic Code]] is adopted as French [[Civil law (legal system)|civil law]].