The New York Stock Exchange was established when a group of 24 brokers and merchants met by a tree on what is now Wall Street and signed the Buttonwood Agreement.
The first Kentucky Derby was held at Churchill Downs, in Louisville, Kentucky.
NBC aired the Information Please quiz show on the radio for the first time.
The Supreme Court ruled unanimously against segregation in schools in Brown v. Board of Education.
Televised Watergate hearings opened, headed by North Carolina senator Sam Ervin.
An Iraqi warplane attacked the U.S.S. Stark in the Persian Gulf, killing 37 American sailors and wounding 62.
Laurent Kabila declared himself president of the Democratic Republic of the Congo.
In Massachusetts, same-sex couples exchanged marriage vows for the first time in the United States.