The first U.S. census was completed, showing a population of 3,929,214 people.
Colorado became the 38th state in the United States.
Adolf Hitler presided over the opening of the Berlin Olympic Games.
President Truman signed the congressional acts that established the Atomic Energy Commission and the Fulbright Scholarship program.
MTV made its debut at 12:01 AM. The first video shown was Video Killed the Radio Star by the Buggles.