- Deposed ministers executed in Liberia
- Jimmy Carter did a number of <a href="http://www.jimmycarterlibrary.org/documents/diary/1980/d042280t.pdf">things</a>.
- The U.S. Supreme Court, in a 6-3 decision, overturns a lower court ruling that an at-large city electoral system in Mobile, Alabama is unconstitutional because it dilutes the voting strength of blacks.
- Fritz Strassman died
- Canada decides to boycott Olympic summer games in Moscow
- A record April heat wave pushed the mercury to 100 degrees in Iowa.
- Cuba announces that anyone who wishes to leave Cuba can depart from Mariel. The Mariel boatlift continues through September and results in 123,000 Cubans coming to the United States. Among these immigrants are several thousand who are criminals and several hundred who are mentally ill.
- Jack Nicholson turned 43.


In other words, not much that day.