May 14: World Fair Trade Day ( 2005), Flag Day in Paraguay.
- 1264 - King Henry III was captured in the Battle of Lewes, making Simon de Montfort the de facto ruler of England.
- 1796 - Edward Jenner began testing cowpox as a vaccine for protection against smallpox.
- 1804 - The Lewis and Clark Expedition departed from Camp Dubois and began traveling up the Missouri River.
- 1948 - Prime Minister David Ben-Gurion publicly read the Declaration of the Establishment of the State of Israel in Tel Aviv.
- 1973 - The NASA space station Skylab was launched from Cape Canaveral.