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On This Day, July 16: U.S. Tests First Atom Bomb

ALAMOGORDO, NEW MEXICO, JUL 16 – The Trinity Test marked the first detonation of an atomic bomb, developed to end World War II, leading to over 12,000 nuclear weapons worldwide today, the Arms Control Association reports.

  • On July 16, 1945, the United States Army detonated the world's first atomic bomb, the Trinity test, at the White Sands Missile Range near Alamogordo, New Mexico.
  • The test was a secret part of the Manhattan Project aiming to create a weapon to help end World War II amid global conflict.
  • The blast unleashed energy comparable to 21,000 tons of TNT, completely destroyed the 30-meter test tower, created the green glass known as trinitite, and produced radioactive fallout that affected approximately 30,000 people downwind.
  • The Arms Control Association reports that there are more than 12,000 nuclear weapons worldwide today, primarily possessed by the United States and Russia, and these modern weapons have significantly greater destructive capability compared to the atomic bomb developed eight decades ago.
  • The Trinity test marked a pivotal moment that changed warfare and inspired ongoing efforts for nuclear disarmament amid lasting health effects on local communities.
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Greenfield Recorder broke the news in on Tuesday, July 15, 2025.
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