April 7: National Beer Day in the United States
Artist's conception of the 2001 Mars Odyssey spacecraft
- 1862 – American Civil War: Union forces defeated Confederate troops at the Battle of Shiloh, the bloodiest battle in U.S. history at the time, in Hardin County, Tennessee.
- 1949 – The Rodgers and Hammerstein musical South Pacific, based on Tales of the South Pacific by James Michener, opened on Broadway.
- 1964 – Reverend Bruce W. Klunder was killed by a bulldozer while he was protesting the construction of a segregated school in Cleveland, Ohio, U.S.
- 1994 – Rwandan Civil War: The Rwandan genocide began a few hours after the assassination of President Juvénal Habyarimana, with hundreds of thousands killed in the following 100 days.
- 2001 – NASA's 2001 Mars Odyssey (artist's conception pictured), the longest-surviving continually active spacecraft in orbit around a planet other than Earth, launched from Cape Canaveral.
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