WHAT HAPPENED IN 1803.
Look what happened the 1803.

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. (1. January 1803)

In Marbury v. Madison, the Supreme Court of the United States establishes the principle of judicial review. (24. February 1803)

Ohio is admitted as the 17th U.S. state. (1. March 1803)

Thousands of meteor fragments fall from the skies of L'Aigle, France; the event convinces European science that meteors exist. (26. April 1803)

Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling the size of the young nation. (30. April 1803)

Napoleonic Wars: The United Kingdom revokes the Treaty of Amiens and declares war on France. (18. May 1803)

The Louisiana Purchase is announced to the American people. (4. July 1803)

The Convention of Artlenburg is signed, leading to the French occupation of Hanover (which had been ruled by the British king). (5. July 1803)

The Surrey Iron Railway, arguably the world's first public railway, opens in south London, United Kingdom. (26. July 1803)

Lewis and Clark start their expedition to the west by leaving Pittsburgh, Pennsylvania at 11 in the morning. (31. August 1803)

British scientist John Dalton begins using symbols to represent the atoms of different elements. (6. September 1803)

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. (11. September 1803)

Second Anglo-Maratha War: Battle of Assaye between the British East India Company and the Maratha Empire in India. (23. September 1803)

The United States Senate ratifies the Louisiana Purchase. (20. October 1803)

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. (18. November 1803)

In New Orleans, Louisiana, 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. (30. November 1803)

The Louisiana Purchase is completed at a ceremony in New Orleans, Louisiana. (20. December 1803)