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Demands for surrender were ignored.
This as well.
July 25: "it is impossible to accept unconditional surrender under any circumstances, but we should like to communicate to the other party through appropriate channels that we have no objection to a peace based on the Atlantic Charter." (U.S. Dept. of State, Potsdam 2, pg. 1260 - 1261).
Unconditional surrender demands were not really ignored so much as rejected.
They wanted the Russians to broker a good deal but the Russians ended up in North Korea instead.
"Unfortunately for all concerned, Japan's leaders were divided over precisely what terms should be sought to end the war, with the Japanese military leaders still wishing to avoid anything that the Allies would have considered a clear "surrender". Surely Japan's leaders hold the lion's share of the responsibility for the fate that befell Japan.
The bombs really did not make a difference. Only the assurance the Emperor would remain on the throne allowed surrender regardless of bombs or no bombs.
"That unconditional surrender remained an obstacle to peace in the wake of Hiroshima, Nagasaki, and the Soviet declaration of war - until the government of the United States offered the necessary (albeit veiled) assurance that neither Emperor nor throne would be destroyed - suggests the possibility, which even Stimson later recognized, that neither bomb may have been necessary; and certainly that the second one was not." (Sherwin, pg. 237, emphasis in original). As noted earlier, Stimson explained, "the Allied reply [to Japan's 8/10 surrender offer]... implicitly recognized the Emperor's position" (Stimson & Bundy, pg. 627).
Atomic Bomb - the Last Resort
There is no way we can know for certain whether this approach would have ended the Pacific war sooner and with fewer deaths. But one may regret that such an attempt was not made. Had the attempt failed, the continuing blockade of supplies, Soviet invasion, and the atomic bombs were still available. However, anyone tempted to use the atomic bomb would have done well to share the hesitancy agreed upon by President Roosevelt and Great Britain Prime Minister Winston Churchill on September 19, 1944: the atomic bomb "might, perhaps, after mature consideration, be used against the Japanese" (Robert Williams and Philip Cantelon, ed., The American Atom, pg. 45). (School of Advanced Airpower Studies historian Robert Pape has written an intriguing paper stating that further conventional air bombing would have been unnecessary: Why Japan Surrendered, International Security, Fall 1993).
It is likely Dwight Eisenhower was right when he said of the atomic bombings of Japan, "it wasn't necessary to hit them with that awful thing." (Ike on Ike, Newsweek, 11/11/63, pg. 108).
After further research I have come to the conclusion that the bombs were unnecessary to end the war.
What was needed was for two vastly different cultures to magically intimately understand the ins and outs of their respective governments and cultures but then if that was so would there have been a war at all?
If Truman had understood the fanatical religious importance (familiar topic?) of the Emperor then perhaps surrender could have occured quickly and peacefully.
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