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How the Manhattan Project changed the world

The remote site produced breakthroughs in fission, plutonium research and bomb design before the Trinity test and the bombings of Hiroshima and Nagasaki.

  • In the summer of 1942, Los Alamos, New Mexico, became the center of the Manhattan Project, the Army's secret mission to develop the atomic bomb during World War II.
  • Perched high in the Jemez Mountains, Los Alamos was chosen for its remote, isolated location, where General Leslie Groves and Robert Oppenheimer led scientists in breakthroughs on atomic fission and bomb design.
  • On July 16, 1945, the world's first atomic bomb was detonated at the Trinity test site in New Mexico, with atomic bombs later dropped on Hiroshima and Nagasaki to help end World War II.
  • Cordova, a downwind community resident, said "the fireball it created went over 40,000 feet into the air," adding that generations in her family have battled cancer from radiation exposure.
  • More than 80 years later, the Manhattan Project remains one of the most controversial chapters in American history, with conversations about power and responsibility continuing as America marks its 250th anniversary.
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How the Manhattan Project changed the world

America 250 | Los Alamos, New Mexico, became the secret hub of the Manhattan Project during World War II, leading to the creation of the atomic bomb and sparking decades of controversy.

·Cincinnati, United States
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KOAT broke the news in Albuquerque, United States on Monday, June 22, 2026.
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