APPENDIX | Chronology EVENT January 1939 German scientists Hahn and Strassmann published results of their 1938 experiments with which they discovered the fission process. September 1, 1939 Nazi Germany invaded Poland; World War December 7 & 15, 1941 United States entered war with Japan and Germany, respectively. August 13, 1942 Manhattan Engineer District established to produce nuclear weapons. December 2, 1942 II began. Physicists under direction of Enrico Fermi at the University of Chicago's Metallurgical Laboratory created the first controlled, self-sustaining nuclear chain reaction. March 15, 1943 Weapon laboratory established at Los July 16, 1945 First atomic bomb, Trinity, detcnatec at Alamogordo, New Mexico by the Alamos, New Mexico. Now called ics Alamos National Laboratory. Manhattan Engineer District. August 6, 1945 August 9, 1945 First atomic bomb "Little Boy" cxcrpec on Hiroshima, Japan. Second atomic bomb "Fat Man" detcrated over Nagasaki, Japan. August 14, 1945 The government of Imperial Japan accepted the Potsdam Declaration anc surrendered. January 26, 1946 The United Nations General Assemsly in London established the United Nations Atomic Energy Commission. June 14, 1946 Bernard Baruch, U. S.- delegate to tne U.N. Atomic Energy Cammission proocsed a plan to outlaw the manufacture cr atomic bombs, dismantle those alreacy existing, and share atomic ener7, secrets with other nations. (‘Tre Soviet AQ