Major Events
- May 17 John Hawkins and Richard French patent the Reaping Machine
- Jul 4 The Louisiana Purchase is announced to the American people by President Thomas Jefferson
- Jul 26 The Surrey Iron Railway, arguably the world's first public railway, opens in south London
- Oct 20 US Senate ratifies the Louisiana Purchase
- Dec 20 French flag lowered in New Orleans to mark the formal transfer of the Louisiana Purchase from France to USA, purchased for $15M
- More 1803 Events
James Brooke
Ralph Waldo Emerson
John Ericsson
Theodore Dwight Weld
Christian Doppler
Hector BerliozMore People Born in 1803
Toussaint Louverture
Samuel AdamsMore 1803 Deaths
Ludwig van Beethoven
Henry Addington
Napoléon Bonaparte
Thomas Jefferson