Editing 1800 (section)

=== April&ndash;June ===
* [[April 2]]
** [[Ludwig van Beethoven]]'s ''[[Symphony No. 1 (Beethoven)|Symphony No. 1]]'' premieres at the [[Burgtheater]], in [[Vienna]].
** The [[Treaty of Constantinople (1800)|Treaty of Constantinople]] establishes the [[Septinsular Republic]], the first autonomous Greek state since the [[Fall of the Byzantine Empire]].
* [[April 3]] &ndash; The first voting, albeit indirect, begins in the [[1800 United States presidential election]] as voters in the state of [[New York (state)|New York]] make [[1800 United States presidential election in New York|their selections for the New York state legislature]], which in turn will vote on October 31 for the state's 12 presidential electors.<ref>''Manual of Westchester County, Past and Present'' (Henry T. Smith, 1898) p. 16</ref> A majority of state legislature members are from the [[Democratic-Republican Party]], rather than the Federalist Party. At the time, only 4 of the 16 U.S. states (Kentucky, Maryland, North Carolina and Virginia) have a popular vote for the presidential electors and the President. The other 12, including New York, have a popular vote for the state legislature, but not for the president. At the time, neither of the major parties have picked their nominees for president and vice president. The result will not be certified until February, [[1801]].<ref>''Narrative and Critical History of America'', ed. by Justin Winsor (Houghton Mifflin, 1888) p. 269</ref> 
* [[April 6]] &ndash; [[War of the Second Coalition]]: [[Siege of Genoa (1800)|Siege of Genoa]] &ndash; General [[André Masséna]] is surrounded by 40,000 Austrian troops under Field Marshal [[Michael von Melas]] and blockaded by a strong British [[Squadron (naval)|squadron]] under Lord [[George Elphinstone, 1st Viscount Keith|Keith]].<ref>{{cite book|first=Reginald George|last=Burton|year=2010|title=Napoleon's Campaigns in Italy 1796–1797 & 1800|page=107|publisher=Leonaur Limited |isbn=978-0-85706-356-4}}</ref>
* [[April 24]] &ndash; The U.S. [[Library of Congress]] is founded in Washington, D.C.
* [[May 14]] &ndash; [[Italian campaigns of the French Revolutionary Wars#Second Coalition (1799–1800)|Second Coalition]]: French forces under General [[Louis-Alexandre Berthier]] are halted by 400 Austro-Piedmont soldiers, at [[Fort Bard]] in the [[Aosta Valley]].<ref>{{cite book|first=Reginald George|last=Burton|year=2010|title=Napoleon's Campaigns in Italy 1796–1797 & 1800|page=115|publisher=Leonaur Limited |isbn=978-0-85706-356-4}}</ref>
* [[May 15]] &ndash; [[Napoleon]] and his French army (40,000 men)—not including the [[field artillery]] and [[Train (military)|baggage trains]]—(35,000 [[Artillery|light artillery]] and [[infantry]], 5,000 [[cavalry]]) begin crossing the [[Alps]]. He selects the shortest route through the [[Great St Bernard Pass]], and invades after five days traversing the northern region of [[Italy]].
* [[June 2]] &ndash; The first [[smallpox]] [[vaccination]] is made in North America, at [[Trinity Bight, Newfoundland and Labrador|Trinity, Newfoundland]].
* [[June 3]] &ndash; U.S. President [[John Adams]] moves to [[Washington, D.C.|Washington]]. Because the [[White House|President's Mansion]] is still under construction, President Adams takes up residence at Tunnicliffe's City Hotel near the unfinished U.S. Capitol Building.<ref>{{cite web|url=http://www.history.com/this-day-in-history/president-john-adams-moves-into-a-tavern-in-washington-d-c|title=1800: President John Adams moves into a tavern in Washington, D.C.|work=This Day in History|publisher=history.com|url-status=live|archive-url=https://web.archive.org/web/20150401120120/http://www.history.com/this-day-in-history/president-john-adams-moves-into-a-tavern-in-washington-d-c|archive-date=1 April 2015}}</ref>
* [[June 4]] &ndash; [[War of the Second Coalition]]: [[Siege of Genoa (1800)|Siege of Genoa]] &ndash; The French army is evacuated from Genoa. Marshal [[André Masséna]] is allowed to march out, with all the honours of war. A portion of his force joins General [[Louis-Gabriel Suchet]], and the rest is conveyed in British ships to [[Antibes]].<ref>{{cite book|first=Reginald George|last=Burton|year=2010|title=Napoleon's Campaigns in Italy 1796–1797 & 1800|page=121|publisher=Leonaur Limited |isbn=978-0-85706-356-4}}</ref>
* [[June 14]]
** [[War of the Second Coalition]]: [[Battle of Marengo]] &ndash; Napoleon defeats the Austrian troops near Marengo, Italy.
** French general [[Jean-Baptiste Kléber]] is assassinated in [[Cairo]] by Syrian [[Kurdish people|Kurdish]] Muslim student [[Suleiman al-Halabi]].
* [[June 15]] &ndash; [[Convention of Alessandria]] (Armistice of Marengo): Austria agrees to evacuate much of Italy.
* [[June 19]] &ndash; [[War of the Second Coalition]]: [[Battle of Höchstädt (1800)|Battle of Höchstädt]] &ndash; General [[Jean Victor Marie Moreau]] leads French forces to victory, opening the [[Danube]] passageway to Vienna.
* [[June 27]] &ndash; [[War of the Second Coalition]]: [[Battle of Neuburg (1800)|Battle of Neuburg]] &ndash; General [[Claude Lecourbe]] leads French forces to victory, securing control of the [[Danube]] from Austria.