Jan 1 Emperor Gia Long orders all bronze wares of the Tây Sơn Dynasty to be collected and melted into nine cannons for the Royal Citadel in Huế, Vietnam.
Jan 12 US Senate approves Thomas Jefferson's nomination of James Monroe and Robert Livingstone to negotiate purchase of New Orleans from France
Feb 4 William Dunlap adapts French melodrama "Voice of Nature
Feb 14 Apple parer patented by Moses Coats, Downington, Pennsylvania
Feb 14 Chief Justice John Marshall declares that any act of U.S. Congress that conflicts with the Constitution is void
Feb 19 US Congress accepts Ohio's constitution, statehood not ratified till 1953
Feb 24 US Supreme Court 1st rules a law unconstitutional (Marbury v Madison)
Feb 25 In the last significant act of the Holy Roman Empire, more than 100 German polities are abolished in a major internal reorganization
Feb 27 Great fire in Bombay, India
Mar 1 Ohio becomes 17th state of the Union
Mar 3 1st impeachment trial of a US federal judge, John Pickering, begins
Mar 3 Colégio Militar is founded in Portugal by Colonel Teixeira Rebello.
Mar 19 Friedrich Schiller's "Die Braut von Messina" premieres in Weimar
Apr 1 French law rules the use of intention
Apr 5 1st performance of Ludwig van Beethoven's 2nd Symphony in D
Apr 26 Meteorites fall in L'Aigle, France
Apr 30 Chancellor Robert Livingston and James Monroe sign Louisiana Purchase Treaty in Paris at a cost of 15 million dollars, doubles the size of the USA
May 16 Peace of Amiens between French Republic and Great Britain ends
May 17 John Hawkins & Richard French patent the Reaping Machine
May 18 Britain declares war on France after Napoleon Bonaparte continues interfering in Italy and Switzerland
