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Albert Einstien writes to president FDR.
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FDR gives $2 billion to start building the Atomic Bomb
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Colonel Leslie Groves is put in charge of the Manhattan Project.
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Enrico Fermi and his team produce the world's first nuclear fission reaction.
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Remodeling of the B-29 to deliver the Atomic Bomb
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The world's first atomic detonation takes place in the 'Trinity Test' at Alamogordo, New Mexico
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President Truman orders atomic bombs to be used.
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Little Boy explodes over Hiroshima killing over 100,000 people