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1 jan 1931 The atom is split by John Crockcroft
21 jan 1932 Heavy Hydrogen is disocvered
8 Jan 1934 The First Nuclear fission is achieved by Enrico Fermi of Italy
1st Sep 1939 World War 2 Begins
6 dec 1941 FDR authorizes the Manhattan Engineering District for the purpose of creating an atomic bomb. Later to be renamed The Manhattan Project.
February 23, 1941 Plutonium is discovered by Glenn Seaborg.
23 sep 1942 Colonel Leslie Groves is placed in charge of the Manhattan Project. J. Robert Oppenheimer becomes the Project's Scientific Director.
2 dec 1942 First controlled nuclear fission reaction is produced by Enrico Fermi at the University of Chicago.
5 may 1943 First controlled nuclear fission reaction is produced by Enrico Fermi at the University of Chicago.
April 27, 1945 The Target Committee of the Manhattan Project select four cities as possible targets for the atomic bomb. They are: Kyoto, Hiroshima, Kokura, and Niigata.
May 8, 1945 War ends in Europe.
May 25, 1945 Leo Szilard attempts to warn President Truman in person concerning the dangers of atomic weapons.
July 13,1945 American intelligence discovers the only obstacle to peace with Japan is 'unconditional surrender'.
July 16, 1945 The world's first atomic detonation takes place in the 'Trinity Test' at Alamogordo, New Mexico.
July 21, 1945 President Truman orders atomic bombs to be used.
July 26, 1945 Potsdam Declaration is issued, calling for the 'unconditional surrender of Japan'.
July 28, 1945 Potsdam Declaration is rejected by Japan.
August 6, 1945 Little Boy, a uranium bomb, is detonated over Hiroshima, Japan. It kills between 90,000 and 100,000 people immediately.
August 7, 1945 U.S. decides to drop warning pamphlets on Japanese cities.
August 9, 1945 The second atomic bomb to hit Japan, Fat Man, was scheduled to be dropped at Kokura. However, because of poor weather the target was moved to Nagasaki.
August 10, 1945 U.S. drops warning leaflets concerning another atomic bomb on Nagasaki, the day after the bomb was dropped.
September 2, 1945 Japan announces its formal surrender.
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