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Why did the US drop the atomic bomb? Historians have debated the issue over the years. On the one hand, Japan was defeated and many civilian leaders wanted to reach conditional surrender terms. After sifting through the records and cross-examining Japanese leaders, the U.S. Strategic Bombing Survey concluded in 1946 that Japan would have surrendered by the end of 1945 because of the devastation wrought by the sea/air blockade, the incessant B-29 and carrier raids. The Survey lends weight to the conclusion, after the war, that the atomic bomb did not have to be used to gain victory. Some "revisionists" have suggested Hiroshima was supposed to be an unmistakable signal to Stalin to play along diplomatically with the Americans who planned to rule the postwar world. Others have wondered whether some sort of demonstration explosion could have been made, in order to frighten Tokyo without killing so many people. The option was considered, but only two bombs were available. Truman decided instead to drop millions of leaflets upon Hiroshima and Nagasaki warning people to leave immediately, and at the Potsdam Conference in mid-July 1945, he explicitly warned Japan it must surrender immediately or be hit with terrible force.

Why did the US drop the atomic bomb? Historians have debated the issue over the years. On the one hand, Japan was defeated and many civilian leaders wanted to reach conditional surrender terms. After sifting through the records and cross-examining Japanese leaders, the U.S. Strategic Bombing Survey concluded in 1946 that Japan would have surrendered by the end of 1945 because of the devastation wrought by the sea/air blockade, the incessant B-29 and carrier raids. The Survey lends weight to the conclusion, after the war, that the atomic bomb did not have to be used to gain victory. Some "revisionists" have suggested Hiroshima was supposed to be an unmistakable signal to Stalin to play along diplomatically with the Americans who planned to rule the postwar world. Others have wondered whether some sort of demonstration explosion could have been made, in order to frighten Tokyo without killing so many people. The option was considered, but only two bombs were available. Truman decided instead to drop millions of leaflets upon Hiroshima and Nagasaki warning people to leave immediately, and at the Potsdam Conference in mid-July 1945, he explicitly warned Japan it must surrender immediately or be hit with terrible force.

The civilian government in Tokyo wanted peace on conditional terms, but that was impossible because of Roosevelt's policy of "unconditional" surrender, and because the civilians did not control Japan's decisions--the Imperial Army did (in the name of the Emperor). It is often assumed that the atomic bombs caused Japan to finally surrender. However, others point to the declaration of war by the Soviet Union who, invaded Manchuria, and crushed the Japanese Army there. Thus ending Japan's feeble hopes for a negotiated peace. However, in reply, other historians have noted that the Soviet Union did not declare war on Japan until August 8, 1945; two days after the first atomic bomb had been dropped. It was a last-minute grab for the spoils of war. It is known that after Hiroshima and the invasion of Manchuria the army and navy still wanted to fight on, while the civilians wanted to give up. The decisive move was the unprecedented intervention of Emperor Hirohito, who ordered negotiations to be opened after the second atomic bomb had been dropped. Even then a small number of Imperial officers tried to stage a coup by occupying the palace grounds. They planned to not allow the broadcast of Hirohito's order; however, their actions failed. With Roosevelt gone, the Americans redefined "unconditional" to allow continuance of the Emperor. On August 15, 1945, Emperor Hirohito then broadcast an order to the nation and its armed forces to surrender, which was obeyed by all but a few who carried out futile last minute suicide attacks which failed. Until that day, the Japanese military leaders were still making their preparations for resisting the expected Allied invasion of the home islands.<ref>Wheeler, Keith. "The Fall of Japan" (1983)</ref>

The civilian government in Tokyo wanted peace on conditional terms, but that was impossible because of Roosevelt's policy of "unconditional" surrender, and because the civilians did not control Japan's decisions--the Imperial Army did (in the name of the Emperor). It is often assumed that the atomic bombs caused Japan to finally surrender. However, others point to the declaration of war by the Soviet Union who, invaded Manchuria, and crushed the Japanese Army there. Thus ending Japan's feeble hopes for a negotiated peace. However, in reply, other historians have noted that the Soviet Union did not declare war on Japan until August 8, 1945; two days after the first atomic bomb had been dropped. It was a last-minute grab for the spoils of war. It is known that after Hiroshima and the invasion of Manchuria the army and navy still wanted to fight on, while the civilians wanted to give up. The decisive move was the unprecedented intervention of Emperor Hirohito, who ordered negotiations to be opened after the second atomic bomb had been dropped. Even then a small number of Imperial officers tried to stage a coup by occupying the palace grounds. They planned to not allow the broadcast of Hirohito's order; however, their actions failed. With Roosevelt gone, the Americans redefined "unconditional" to allow continuance of the Emperor. On August 15, 1945, Hirohito then broadcast an order to the nation and its armed forces to surrender, which was obeyed by all but a few who carried out futile last minute suicide attacks which failed. Until that day, the Japanese military leaders were still making their preparations for resisting the expected Allied invasion of the home islands.<ref>Wheeler, Keith. "The Fall of Japan" (1983)</ref>

===Military Opposition to A-Bomb===

===Military Opposition to A-Bomb===