Re: Wasn't this handled last time?
This is OTT for the "First GPS Millenium", but...
Yes, I'm well aware of who firebombed Tokyo and why. I'm also aware that some other cities, among them Hiroshima and Nagasaki, were deliberately not bombed with conventional weapons so that the strategists could get a better assessment of the destructive abilities of atomic weapons.
There's a lot about this in Richard Rhodes book "The Making Of The Atomic Bomb".
If you want to understand the scientific and political background to the Manhattan Project as well as learning about the politicians, military and scientists involved and other country's atomic weapon projects (yes, Japan had one as well), this is the book to read. Another title for it could have been "The History of Atomic Physics: 1995-1945", possibly more accurate but a lot less likely to attract readers.