In 1963, Martin Luther King Jr. delivered his famous “I Have a Dream” speech to 200,000 people at a peaceful civil rights rally in front of the Lincoln Memorial in Washington. (AFP/Getty Images)
1609: English navigator Henry Hudson discovered Delaware Bay.
1833: England’s Parliament banned slavery in the British empire.
1981: John Hinckley Jr. pleaded not guilty to charges he had tried to assassinate President Ronald Reagan five months earlier.
1996: The troubled 15-year marriage of Britain’s Prince Charles and Princess Diana ended officially with the issuance of a divorce decree.
Compiled by Laura Lefavor and Paul McCardell.