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Timeline

December 1938

Nuclear Fission demonstrated
   
  

August 2, 1938

Einstein writes a letter to Roosevelt

August 1942

Manhattan Engineer District is formed, goal is to build an atomic bomb within three years
  
  

September 17, 1942

Col. Groves becomes military leader of Manhattan Project

July 16, 1945

First atomic test, called "Trinity"
  
  

August 6, 1945

First atomic bomb is dropped on Hiroshima