When Truman told Stalin about the Manhattan project in July of 1945, Stalin displayed little reaction, since Stalin had known about the project for almost 4 years before Truman, and he arguably knew more about it than Truman himself did.

POTSDAM AND THE FINAL DECISION TO USE THE BOMB

After President Harry S. Truman received word of the success of the Trinity test, his need for the help of the Soviet Union in the war against Japan was greatly diminished. The Soviet leader, Joseph Stalin, had promised to join the war against Japan by August 15th. Truman and his advisors now were not sure they wanted this help. If use of the atomic bomb made victory possible without an invasion, then accepting Soviet help would only invite them into the discussions regarding the postwar fate of Japan. During the second week of Allied deliberations at Potsdam, on the evening of July 24, 1945, Truman approached Stalin without an interpreter and, as casually as he could, told him that the United States had a “new weapon of unusual destructive… Continue Reading (7 minute read)