Another was to give a very long warning of the spot it would be dropped so the civilians could make their way out in time. The advisors, Truman, and most of the public thought that Japan would be far to stubborn to listen to anything the United States said or pay attention to anything the U.S. did. .
Another committee was set up to decide on where to drop the bomb. It had to be big enough to show its full affect, and it also had to be somewhere that had not been previously damaged. If the United States dropped the bomb on rubble, the Japanese wouldn't know what it could really do. They quickly decided on Hiroshima because it was a big city and mostly undamaged. It was also flat, which would help the radiation get into the ground and travel farther. The next spot was much more difficult to chose. The committee made a list of the possible places, and Nagasaki came up second. It was second on the list because it had many important factories within it. It also had hilly terrain, which would hold back the bombs affect. But they decided to keep it second because the first bomb would already have been dropped and showed its strength. While the planning of the drop was going on, the production of the bomb was coming along well. The United States built two types of bombs. The bomb using uranium was called little boy. The bomb using plutonium was called fat man. The plutonium bomb was tested on July 16, 1945. The experiment was a huge success. The explosion was estimated to be equal to 18,000 tons of TNT. Now that the United States were all set, they looked to see what was happening in Japan. .
The Allies made a dramatic appeal for the Japanese to surrender on July 26, 1945. This appeal was called the Potsdam Declaration. It didn't talk about the new atomic bomb, nor did it offer to spare the Japanese emperor, since a study said 1/3 of Americans wanted him hanged. The Prime Minister of Japan, Suzuki, rejected the declaration on July 28, 1945.