George Washington was inaugurated as the first U.S. president in 1789.
The United States purchased the Louisiana Territory from France under the Louisiana Purchase agreement in 1803 (the treaty was signed May 2, but dated April 30).
Louisiana became the 18th U.S. State in 1812.
Television first publicly broadcast from the Empire State Building in 1939.
Adolf Hitler committed suicide in 1945.
The Vietnam War ended in 1975.