just my two cents . . .
The only one of the major allied powers who had the same delegate at the Potsdam Conference was Russia. FDR was dead, and Churchill wasn't relected, and only stalin remained of the original trio. Consequently, he broke many promises made to the other two when Truman came into the scene, and something tells me Potsdam got screwed up becuase of the new leaders.
Secondly, if I remember correctly, the A-bomb was to be used against Germany. The only problem, was that Germany surrenered before they were ready. And then, we were looking at a land invasion of the Japanese homeland--which would inevitably be a costly procedure, no matter the figure you go by for casuality figures. While the bomb itself wasn't necessary to end the war, it did help bring it to an end a little bit sooner.
I might have more later, need to clarify my thoughts.
All a man's knowledge comes from his experiences
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