- April 7, 1940 (80 years ago)
- •Booker T. Washington becomes the first African American to be depicted on a United States postage stamp.
- April 7, 1948 (72 years ago)
- •The World Health Organization is established by the United Nations.
- April 7, 1978 (42 years ago)
- •Development of the neutron bomb is canceled by U.S. President Jimmy Carter.