- May 26 Territory South of River Ohio created by US Congress
Constitution of the United States
May 29 Rhode Island becomes last of original 13 colonies ratifying US Constitution
- May 31 Alferez Manuel Quimper explores the Strait of Juan de Fuca (now the international border between Canada and the US)
- May 31 US copyright law enacted
Authors
Dictators
Explorers
Outlaws
Queens
Spies