Actually it is a good thing for both sides that they did surrender after the bombing of Nagasaki.
After the dropping of the two prototypes we did not have any A-bombs left and would not be able to make any more for at least a year.
It had taken over two years to produce enough U-235 and Pu-239 to make the tower test bomb, the Hiroshima bomb and the Nagasaki bomb.
Mass production facilities were being built but the material for the three bombs had been made at what were essentially laboratory scale or concept demonstration facilities.
Had Japan not surrendered after the second bomb was dropped a land invasion would have taken place.
We were out of nuclear weapons.
We still had LeMay.
The sources I'd heard from stated that we had material for 10 weapons. I had heard we had acquired some materials from captured or abandoned Axis labs.
I'll have to go back to those sources and see how accurate they are.