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John Crockcroft and E.T.S. Watson split the atom for the first time.
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Enrico Fermi creates the first nuclear fission reaction at the University of Chicago.
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Many famous scientists such as Albert Einstein, Neils Bohr, and Leo Szilard flee Germany-controlled Europe and immigrate to the US.
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Leo Szilard drafts a letter explaining to President Roosevelt the dangers of an atomic bomb by Germany, and the need to start research on it. Albert Einstein is coerced into signing it.
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World War 2 begins with the invasion of Poland by Germany.
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FDR responds back to Albert Einstein, and a committee on uranium is formed as a result.
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The advisory committee on uranium met to discuss what was mentioned in the letter. They reported back that uranium "would provide a possible source of bombs with a destructiveness vastly greater than anything now known."
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Plutonium is discovered by Glenn T. Seaborg.
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This created the Office of Scientifc Research and Development which was used for large scientific engineering projects. The. main part was the S-1 Uranium Committee.
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FDR allows scientists to begin development of an atomic weapon.
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The Manhattan Engineering District is made for creating an atomic weapon. It later becomes known as the Manhattan project.
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Japan attacks Pearl Harbor. The US enters War World 2.
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Enrico Fermi creates the first controlled nuclear fission reaction.
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The military Policy Committee makes Japan the primary target of future nuclear bombs.
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Franklin Delano Roosevelt dies. Harry Truman becomes President.
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The War in Europe ends.
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Leo Szilard tries to warn President Truman about the dangers of nuclear weapons.
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American agents discover that Japan will not surrender unconditionally.
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First atomic bomb is detonated at New Mexico as the Trinity Tes
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President Truman orders atomic bombs to be used on Japan.
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Potsdam Declaration is sent to Japan's unconditional surrender.
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Japan calls the atomic bomb a hoax and rejects the Potsdam Declaration.
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A uranium gun type bomb called Little Boy is dropped on Hiroshima, Japan. It instantly kills 100,000 people.
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US bombers drop pamphlets on Japan about the atomic bomb and the terms of the Potsdam Declaration calling for Japan's surrender.
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Fat Man, a second plutonium bomb was supposed to be dropped in Kokura. However, bad weather caused it to be dropped on Nagasaki instead.
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President Truman delivers a speech to the American public detailing the atomic bomb drop on Hiroshima and Nagasaki and the significance of these bombings.
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More Pamphlets similar to the first set are dropped following the Nagasaki bombing.
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Japan surrenders. World war 2 is over.The atomic bomb has done its job.
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Edward Teller, one of the scientists during the Manhattan Project, asks Oppenheimer to help him build a hydrogen bomb. Oppenheimer refuses.
