To my knowledge, there were only the two bombs built for the job, and the real hope was that only one would do the job of convincing the Japanese to surrender unconditionally.
For those who are unaware, there were a great many wild fears associated with the detonation of the atomic bomb. The scientists involved with the development weren't completely sure that the fission would stop, that the detonation might possibly trigger a global chain reaction. They had no inkling of the effects of ionizing radiation until after
the bombs were dropped(hence all of the military experiments in the Nevada desert in the fifties).
I don't see that anyone has posted on this thread to the effect that dropping the bombs was wrong, a mistake, etc. Apparently, we here on the BBB aren't in that over-educated lot. I'm certainly not. IMO, dropping the bombs was a far better alternative for all sides involved than the invasion of the Japanese mainland, for all of the reasons stated above.
DB's right, the Japanese were in the process of building their "Greater Asia Co-Prosperity Sphere", and had expansionist aspirations for the sake of acquiring raw materials. It was an ego trip on the order of what some elements are taking on here in the U.S.....................oops, wrong thread...............
So Haggis, with this thread, were you either trying to post a topic eveyone would agree on, or were you trolling for a loonie the rest of us could dogpile onto, figuratively speaking?