April 4th

2011
Yielding to political opposition, the Obama administration gave up on trying avowed Sept. 11 mastermind Khalid Sheik Mohammed and four alleged co-conspirators in civilian federal courts and said it would prosecute them instead before military commissions.
2007
Radio host Don Imus made offensive on-air remarks about the Rutgers University women's basketball team. He was later fired by CBS Radio and cable network MSNBC.
Don Imus
2006
The Iraq tribunal charged Saddam Hussein and six others, accusing them of genocide and crimes against humanity stemming from a 1980s crackdown against Kurds.
Trial of Saddam Hussein
2003
Sammy Sosa of the Chicago Cubs became the 18th major league baseball player to hit 500 career home runs.
500 home run club
1988
The Arizona Senate convicted Gov. Evan Mecham of two charges of official misconduct and removed him from office.
Impeachment in the United States
1981
Henry Cisneros became the first Hispanic elected mayor of a major U.S. city - San Antonio, Texas.
Henry Cisneros
1979
Zulfikar Ali Bhutto is executed. The former President of Pakistan had been deposed by a coup d'etat. He was hanged despite international calls to stop the execution.
Zulfikar Ali Bhutto
1975
Bill Gates and Paul Allen establish Microsoft. Today, Microsoft has become a multinational corporation, which is the world's largest software maker by revenue.
History of Microsoft
1974
Hank Aaron of the Atlanta Braves tied Babe Ruth's career home run record by hitting his 714th round-tripper in Cincinnati.
Hank Aaron
1973
World Trade Center, then the world's tallest building, opens in New York (110 stories).
World Trade Center (1973–2001)
1969
Denton Cooley implants the first artificial heart. The machine kept patient Haskell Karp alive for 65 hours. He died before a human heart could become available.
Denton Cooley
1968
Martin Luther King is assassinated. The civil rights activist was killed by James Earl Ray. Ray, a segregationist, received a 99-year prison sentence. He died in jail in 1998.
Assassination of Martin Luther King Jr.
1949
NATO is formed. 12 nations signed the North Atlantic Treaty to establish what is today one of the world's most important military alliances.
NATO
1902
British financier Cecil Rhodes left $10 million in his will to provide scholarships at Oxford University in England.
1888
Baseball Hall of Famer Tris Speaker was born in Hubbard, Texas.
Tris Speaker
1887
Susanna Medora Salter became the first woman elected mayor of an American community - Argonia, Kan.
Susanna M. Salter
1850
The city of Los Angeles was incorporated.
City of Los Angeles
1841
President William Henry Harrison died of pneumonia one month after his inauguration, becoming the first U.S. president to die in office.
William Henry Harrison
1818
Congress decided the U.S. flag would consist of 13 red and white stripes and 20 stars, with a new star to be added for every new state.
Flag of the United States
1655
Battle at Postage Farina, Tunis: English fleet beats Barbary pirates.
Robert Blake (admiral)
1581
Francis Drake knighted by Queen Elizabeth I aboard Golden Hind at Deptford.
Francis Drake