Atomic Bomb: Fission vs. Fusion Just before the beginning of World War II, Albert Einstein wrote a letter to President Franklin D. Roosevelt. Urged by Hungarian-born physicists Leo Szilard, Eugene Wingner, and Edward Teller, Einstein told Roosevelt about Nazi German efforts to purify Uranium-235 which might be used to build an atomic bomb. Shortly after that the United States Government began work on the Manhattan Project. The Manhattan Project was the code name for the …showed first 75 words of 1655 total…

…showed last 75 words of 1655 total…e United States should have warned the Japanese, or that we should have invited them to a public demonstration. "In retrospect that U.S. use of the atomic bomb may have been the first act of the cold war."(Grolier 8) On the other side, advocates claimed that the invasion of the Japanese islands could and would result in over one million military casualties plus the civilian losses based on previous invasions of Japanese occupied islands.