The United States exploded a hydrogen bomb on Eniwetok, an island in the Pacific Ocean. The detonation destroyed the island in a three-mile wide mushroom cloud. The successful test marked a new era in the arms race.
The United States began a voluntary nuclear test moratorium in hopes that the USSR would agree to do the same. The Soviets resisted at first, completing tests on November 1 and 3, before beginning a self-imposed twelve-month ban.