1803 events in history

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
Feb 24 In Marbury v. Madison, the Supreme Court of the United States establishes the principle of judicial review
Mar 1 Ohio is admitted as the 17th U.S. state
Apr 26 Thousands of meteor fragments fall from the skies of L'Aigle, France; the event convinces European science that meteors exist
Apr 30 Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling the size of the young nation
May 18 Napoleonic Wars: The United Kingdom revokes the Treaty of Amiens and declares war on France
Jul 4 The Louisiana Purchase is announced to the American people
Jul 5 The Convention of Artlenburg is signed, leading to the French occupation of Hanover (which had been ruled by the British king)
Jul 26 The Surrey Iron Railway, arguably the world's first public railway, opens in south London, United Kingdom
Aug 31 Lewis and Clark start their expedition to the west by leaving Pittsburgh, Pennsylvania at 11 in the morning
Sep 6 British scientist John Dalton begins using symbols to represent the atoms of different elements
Sep 11 Battle of Delhi, during the Second Anglo-Maratha War, between British troops under General Lake, and Marathas of Scindia's army under General Louis Bourquin
Sep 23 Second Anglo-Maratha War: Battle of Assaye between the British East India Company and the Maratha Empire in India
Oct 20 The United States Senate ratifies the Louisiana Purchase
Nov 18 The Battle of Vertières, the last major battle of the Haitian Revolution, is fought, leading to the establishment of the Republic of Haiti, the first black republic in the Western Hemisphere
Nov 30 In New Orleans, Spanish representatives officially transfer the Louisiana Territory to a French representative. Just 20 days later, France transfers the same land to the United States as the Louisiana Purchase
Dec 20 The Louisiana Purchase is completed at a ceremony in New Orleans, Louisiana