The only problem with dropping the two atom bombs was that we didn’t have any more of them.
Au contraire my FRiend, in fact there was a third atomic bomb ready for shipment to Tinian Island that would have been designated for Tokyo on 19 August 1945 had the Japanese NOT surrendered. That is based on a memo between General General John Hull and Colonel L.E. Seeman on 13 August, and that memo further stated that if the Japs didn't run up the white flag after Tokyo was nuked, that another bomb would be ready for another drop at either the end of August or the first part of September. There were tentatively
4 atomic bombs slated for Japan in September 1945. and three more in October. Our atomic assembly line was running 24 hours a day, 7 days a week.
Here, read the memo:
http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB162/72.pdf