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  1. Manhattan District The Trinity test of the Manhattan Project on 16 July 1945 was the first detonation of a nuclear weapon. Active 1942–1946 Disbanded 15 August 1947 Country United States United Kingdom Canada Branch U.S. Army Corps of Engineers Garrison/HQ Oak Ridge, Tennessee, U.S. Anniversaries 13 August 1942 Engagements Allied invasion of Italy Allied invasion of France Allied invasion of ...

  2. Nov 1, 2013 · The first is this one, showing total employment by month, broken into the various important Manhattan Project categories: Let’s just take a moment to marvel at this. They went from pretty much just talking about a bomb, in theory, on paper, in late 1942, and had a project with 125,310 active employees at its peak, 22 months later.

  3. Jul 26, 2017 · The OSRD formed the Manhattan Engineer District in 1942 and based it in the New York City borough of the same name. U.S. Army Colonel Leslie R. Groves was appointed to lead the project.. Fermi and ...

  4. Feb 21, 2024 · Maps. More than 500,000 people contributed to the Manhattan Project including workers, scientists, engineers, and political leaders. The Manhattan Project affected hundreds of thousands more through the world’s first nuclear detonation and the atomic bombings of Japan in 1945. Since then, Manhattan Project legacies have unfolded to produce ...

  5. Apr 4, 2023 · The Manhattan Project went from an idea to a reality in just a few short years because of the tens of thousands of workers who contributed to the top-secret project. Many worked at the project's three main centers of operation in Hanford, Los Alamos, and Oak Ridge. Others worked at the project's numerous smaller sites across the US. Most did ...

  6. The Manhattan Project was a United States research and development program during the Second World War that resulted in the creation and detonation of the world’s first nuclear weapons. The ...

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  8. 2 days ago · Manhattan Project, U.S. government research project (1942–45) that produced the first atomic bombs. The project’s name was derived from its initial location at Columbia University, where much of the early research was done. The first bomb was exploded in a test at Alamogordo air base in southern New Mexico on July 16, 1945.

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