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Second World War: The Manhattan Project

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In 1939, during the Second World War, the Manhattan Project was a research and development covenant that implemented the production of the first nuclear weapons. With the help and support of other countries such as Canada and the United Kingdom, this project was conducted by the United States and was modestly led before it began employing over 130,000 people. From 1942 to 1946, the late United States Army Corps of Engineers officer, Major General Leslie Groves, was in charge of the Manhattan Project. During this time, two types of atomic bombs were developed during the war; a complex implosion-type nuclear weapon, a bomb that is surrounded by high explosives that compress mass, which could result in criticality and a gun-type fission weapon
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