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In 1931, heavy hydrogen or deuterium is discovered by Harold C. Urey.
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The atom is split by John Crockcroft and E.T.S. Walton of Great Britain thereby proving Einstein's Theory of Relativity.
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Hungarian physicist Leo Szilard realizes the possibility of the nuclear chain reaction.
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In 1934, the first nuclear fission is achieved by Enrico Fermi of Italy.
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At a conference at George Washington University, Niels Bohr announces the discovery of fission.
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In August 1939, Albert Einstein writes to President Franklin Roosevelt concerning the use of uranium as a new source of energy leading to the formation of the Committee on Uranium.
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World War II Begins
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In 1939, the Theory of Nuclear Fission is announced by Lise Meitner and Otto Frisch.
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On the 23rd of February, 1941, Plutonium was discovered by Glenn Seaborg.
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In October 9th, 1941, Franklin D. Roosevelt gave the go-ahead for the development of an atomic weapon.
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In 1943 the federal government said they would name a bomber for New Mexico if they raised 30,000 dollars in war bonds.
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Franklin Roosevelt dies on April 12, 1945 making Harry Truman the 33rd president of the United States.
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In May, 1945, the War Ends.
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The world's first atomic detonation takes place in the 'Trinity Test' at Alamogordo, New Mexico in July 16th, 1945.
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President Truman orders atomic bombs to be used.
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Potsdam Declaration is rejected by Japan 2 days later.
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Fat Man was dropped in August 9, 1945 on Nagasaki.
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Little Boy was the bomb that was dropped on Hiroshima on August 6th.
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Japan announces its formal surrender on the second of September, 1945.
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Potsdam Declaration is issued on the 17th of October, 1945, calling for the 'unconditional surrender of Japan'.