1609:Henry Hudson discovered Delaware Bay.
1850:Richard Wagner's opera, Lohengrin, premiered at Weimar, Germany.
1922:The first commercial to be broadcast on radio aired on station WEAF in New York City. The ten minute advertisement for the Queensboro Realty Company cost $100.
1963:Dr. Martin Luther King, Jr. gave his famous "I Have a Dream" speech at the Lincoln Memorial to civil rights demonstrators.
1968:Anti-Vietnam war protesters and police clashed in the streets of Chicago while the Democratic National Convention nominated Hubert H. Humphrey for president.