Here’s a look at some interesting events that took place on this day in history:

1818 – The US Congress adopts a flag with 13 red and white stripes and one star for each state (More info)

1841 – President William Henry Harrison dies from pneumonia just one month after his inauguration (More info)

1968 – Martin Luther King, Jr. is assassinated by James Earl Ray at a motel in Memphis, Tenn. (More info)

1975 – Microsoft is founded by Bill Gates and Paul Allen in Albuquerque, N.M. (More info)

1983 – Sally Ride becomes the first US woman in space (More info)