In 1968, Martin Luther King Jr. was assassinated in Memphis while standing on a motel balcony. His last speech was "I've Been to the Mountaintop," delivered at the Mason Temple a day earlier. Above, King speaks at a conference at the Lord Baltimore Hotel in 1965. (William H. Mortimer, Baltimore Sun file photo)
1818: Congress decided the flag of the United States would consist of 13 red and white stripes and 20 stars, with a new star to be added for every new state of the Union.
1850: The city of Los Angeles was incorporated.
1945: During World War II, U.S. troops on Okinawa encountered the first significant resistance from Japanese forces.
1949: 12 nations, including the United States, signed the North Atlantic Treaty.