How long did it take to build the atomic bomb?

Answer 1

The atomic bombings of the cities of Hiroshima and Nagasaki in Japan were conducted by the United States during the final stages of World War II in 1945. These two events represent the only use of nuclear weapons in war to date.

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The United States, with assistance from the United Kingdom and Canada, designed and built the bombs under the codename Manhattan Project; initially for use against Nazi Germany and inspired by the correct assumption that Germany would also conduct an atomic bomb project, and incorrect assumption that the Nazis held a lead in atomic weapons research. The first nuclear device, called "Gadget," was tested near Alamogordo, New Mexico on July 16, 1945. The Hiroshima and Nagasaki bombs were the second and third to be detonated and the only ones ever employed as weapons.

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Hiroshima and Nagasaki weren't the first times that the Allies had bombed Axis cities without specifically targeting military installations, nor the first time that such bombings had caused huge numbers of civilian casualties, nor the first time that such bombings were (or came to be) controversial. In Germany, the Allied firebombing of Dresden resulted in roughly 30,000 deaths. The March 1945 firebombing of Tokyo may have killed as many as 100,000 people. By August, about 60 Japanese cities had been destroyed through a massive aerial campaign, including large firebombing raids on the cities of Tokyo and Kobe.

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Over 3½ years of direct U.S. involvement in World War II, approximately 400,000 American lives had been lost, roughly half of them incurred in the war against Japan. In the months prior to the bombings, the Battle of Okinawa resulted in an estimated 50-150,000 civilian deaths, 100-125,000 Japanese or Okinawan military or conscript deaths and over 72,000 American casualties. An invasion of Japan was expected to result in casualties many times greater than in Okinawa.

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U.S. President Harry S.Truman, who was unaware of the Manhattan Project until Franklin Roosevelt's death made the decision to drop the bombs on Japan. His stated intention in ordering the bombings was to bring about a quick resolution of the war by inflicting destruction, and instilling fear of further destruction, that was sufficient to cause Japan to surrender. On July 26 Truman and other allied leaders issued The Potsdam Declaration outlining terms of surrender for Japan:

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"...The might that now converges on Japan is immeasurably greater than that which, when applied to the resisting Nazis, necessarily laid waste to the lands, the industry and the method of life of the whole German people. The full application of our military power, backed by our resolve, will mean the inevitable and complete destruction of the Japanese armed forces and just as inevitably the utter devastation of the Japanese homeland..."

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"...We call upon the government of Japan to proclaim now the unconditional surrender of all Japanese armed forces, and to provide proper and adequate assurances of their good faith in such action. The alternative for Japan is prompt and utter destruction."

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The next day, Japanese papers reported that the declaration, the text of which had been broadcast and dropped on leaflets into Japan, had been rejected. The atomic bomb was still a highly guarded secret and not mentioned in the declaration.

Answer 2

the Atomic Bomb was created in less then two years. it took a year and a half.

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