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Gereman scientists Lise Meitner and otto Frisch identify fission in uranium atoms.
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Two scientists, Leo Szilard and Eugene Wigner ask Albert Einstein to write to President Roossevelt, explaing that a powerful new weapon might be possible.
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Germany invades Poland; Great Britain and France declare war on Germany.
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President Roosevelt orders a committee to investigate the possibility of creating atomic bomb.
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Allies issued Potsdam Decleration, demanding Japan to surrender
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