Sparked by refugee physicists in the United States, the program was slowly organized after German scientists discovered nuclear fission in 1938, and many US scientists expressed the fear that Hitler would attempt to build a fission bomb. ... Finally, in 1945, uranium-235 of bomb purity was shipped to Los Alamos, where it was fashioned into a gun-type weapon. ... The result was tested at Alamogordo, New Mexico, on July 16, 1945, and was the first explosion of an atomic bomb code-named Trinity (Beyer 55). ... FDR died on April 12, three months before the first successful Trinity test (Beyer ...

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