On this day in history Marh6,
- 1970 – An explosion at the Weather Underground safe house in Greenwich Village kills three.
- 1975 – For the first time the Zapruder film of the assassination of John F. Kennedy is shown in motion to a national TV audience by Robert J. Groden and Dick Gregory.
- 1975 – Algiers Accord: Iran and Iraq announce a settlement of their border dispute.
- 1981 – After 19 years of presenting the CBS Evening News, Walter Cronkite signs off for the last time.
- 1983 – The first United States Football League game is played.
- 1987 – The British ferry MS Herald of Free Enterprise capsizes in about 90 seconds killing 193.
- 1988 – Three Provisional Irish Republican Army volunteers are killed by Special Air Service on the territory of Gibraltar in the conclusion of Operation Flavius.
- 1990 – Ed Yielding and Joseph T. Vida set the transcontinental speed record flying a SR-71 Blackbird from Los Angeles to Virginia in 64 minutes, averaging 2,124 mph.
- 1992 – The Michelangelo computer virus begins to affect computers.