The Atomic bomb took 6 years to develop (1939-1945) for scientists to work on a equation to make the U-235 into a bomb. The most complicated process in this was trying to produce enough uranium to sustain a chain reaction. The bombs used on the cities cost about $2 billion to develop, this also making the U.S. wanting to use them against Japan. "Hiroshima was a major military target and we have spent 2 billion dollars on the greatest scientific gamble in history- and won." (3) The bomb dropped on Hiroshima weighted 4.5 tons and the bomb used on Nagasaki weighted 10 kilotons. On July 16, 1945, the first ever atomic bomb was tested in the Jamez Mountains in Northern New Mexico, code named "Gadget." The single weapon ultimately dropped on Hiroshima, nicknamed "Little Boy," produced the amo

thousand tons of TNT, which is roughly seven times greater than all of the bombs dropped by all the allies on all of Germany in 1942.

was chosen as a target because it was a major naval and shipbuilding center. At the time of the bombing, the Nagasaki shipyards were the largest privately owned shipyards in Japan. Although the U.S. argued that there were a limited number of bombs available, and that it would be a waste of money, people thought they still should have demonstrated what the A-bomb would in fact do to Japan. Truman and others believed the invasion of the Japanese mainland would be extremely costly, and that making the bomb as a military weapon whose use was fully condoned and never questioned. "At no time, from 1941 to 1945, did I ever hear it suggested by the President, or any other responsible member of the government, that atomic energy should not be used in the war." (23) Prior to the dropping of the A-bomb on Hiroshima, Truman had somewhat of an idea that Japan was on the verge of surrendering. On August 14, 1945 the Japanese surrendered unconditionally and the war in Asia ended.

The first Japanese City bomb was Hiroshima on August 6, 1945. An American

B-29 bomber, named Enola Gay, flown by the pilot Paul W. Tibbets, dropped the "Little Boy" uranium atomic bomb. Three days later a second bomb named "Fat Boy," made of plutonium was dropped on the Japanese city of Nagasaki. After being released, it took approximately one minute for Little Boy to reach the point of explosion, which was about 2,000 feet.

The impact of the bombs on the cities and people was massive. Black rain contain

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