| Date | Weekday | Event |
| May 9, 1502 | Friday | Columbus left Spain on his 4th & final trip to the New World |
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| May 9, 1754 | Thursday | 1st newspaper cartoon in America Divided snake `Join or die' |
| May 9, 1882 | Tuesday | Telegraph Hill RR Co organized |
| May 9, 1913 | Friday | 17th amendment providing for election of senators by popular vote |
| May 9, 1925 | Saturday | Cornerstone for Hebrew University layed |
| May 9, 1926 | Sunday | Americans Byrd & Bennett make 1st airplane flight over North Pole |
| May 9, 1936 | Saturday | Italy annexed Ethiopia |
| May 9, 1944 | Tuesday | 1st eye bank opened in NYC |
| May 9, 1945 | Wednesday | Czechoslovakia liberated from Nazi occupation (Natl Day) |
| May 9, 1946 | Thursday | 1st Variety show - NBC's Hour Glass premiers |
| May 9, 1950 | Tuesday | Robert Schuman announces Plan for European integration |
| May 9, 1961 | Tuesday | Jim Gentile hits grand slammers in consecutive innings |
| May 9, 1961 | Tuesday | FCC Chairman Newton N Minow criticizes TV as a `vast wasteland' |
| May 9, 1974 | Thursday | House Judiciary Committee begin formal hearings on Nixon impeachment |
| May 9, 1975 | Friday | Brian Oldfield shot puts 22.86 m (world record) |