711 – Umayyad troops led by Tariq ibn Ziyad landed at Gibraltar, beginning their conquest of Hispania.
1006 – SN 1006, the brightest supernova in recorded history, appeared in the constellation Lupus.
1789 – George Washington (pictured) took the oath as the first President of the United States of America at Federal Hall in New York City.
1803 - Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling – overnight – the size of the young nation.
1900 - Casey Jones dies in a train wreck in Vaughn, Mississippi, while trying to make up time on the Cannonball Express.
1870 - Franz Lehár, Austrian composer born. (d. 1948) (Lehar known in Hungarian as Lehár Ferenc, was an Austrian composer of Hungarian descent, mainly known for his operettas.)
Lippen schweigen from “The Merry Widow” and more sung by Placido Domingo Hei Kyung-Hong, Jose Carreras, Luciano Pavarotti
1883 - Édouard Manet, French painter died. (b. 1832) (Manet was a French painter. One of the first nineteenth century artists to approach modern-life subjects, he was a pivotal figure in the transition from Realism to Impressionism.)
A Bar at the Folies-Bergère (Le Bar aux Folies-Bergère), 1882
1904 - The Louisiana Purchase Exposition World's Fair opens in St. Louis, Missouri.
1927 - Douglas Fairbanks and Mary Pickford become the first celebrities to leave their footprints in concrete at Grauman's Chinese Theater in Hollywood.
1945 – World War II: As Allied forces were closing in on Berlin, Adolf Hitler and Eva Braun committed suicide in the Führerbunker after being married for one day.
1948 – About 21 countries signed a charter in Bogotá, Colombia establishing the Organization of American States.
1975 – North Vietnamese troops captured Saigon, ending the Vietnam War with the unconditional surrender of South Vietnam.
1983 - George Balanchine, Russian-born dancer and choreographer died. (b. 1904) (Balanchine was a Russian-speaking ballet master of Georgian extraction.[1] He is one of the 20th century's foremost choreographers and one of the founders of American ballet. His work formed a bridge between classical and modern ballet.)
1993 - The World Wide Web was born at CERN.
2004 - U.S. media release graphic photos of American soldiers abusing and sexually humiliating Iraqi prisoners at Abu Ghraib prison.