i am become death destroyer of worlds By hellobigbozo 1789 Discovery of uranium Period: 1789 to 1911 Early development 1911 High detail model of the atom 1933 Conception of nuclear fission 1939 Roosevelt forms the Advisory Committee on raniumU 1941 Pearl Harbor attack and America joining the war 1941 British scientist confirms the possibility of a uranium based bomb 1942 Manhattan Project created 1945 Hiroshima and Nagasaki get bombed by the US 1945 The Trinity test