In 1834, Britain abolished slavery in all of its colonies.
In 1876, Colorado was admitted as the 38th U.S. state.
In 1957, the United States and Canada announced the formation of the North American Aerospace Defense Command (NORAD).
In 1966, ex-Marine Charles Whitman, who had murdered his wife and mother earlier in the day, opened fire from a tower at the University of Texas at Austin, killing 14 peo…