The United States and the world's other major nuclear powers signed a treaty to end all testing and development of nuclear weapons.
Congress passed the First Judiciary Act which provided for a U.S. attorney general and the Supreme Court.
The Brooklyn Dodgers played their last game at Ebbets Field.
The Enterprise, the first nuclear-powered aircraft carrier, was launched.
The trial of the "Chicago Eight," radical antiwar and counterculture activists accused of conspiring to incite riots at the 1968 Democratic convention, began.
Children's author Theodor Seuss Geisel, better known as Dr. Seuss, died at age 87.
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