[Splitter]

Yes, as far as I know, the western Allies were all aware of the Manhattan project one way or another.

The US flat out told Churchill we had the bomb. The Soviets were not told so specifically, but they knew about the Manhattan project through their spy network in the States. The Communist Party was fairly large here before the war so recruits were easy to come by (nothing against the Soviets on that front, spying was just part of the game). They did not, however, think the US has developed the bomb yet.

(Interestingly and as an aside, the Nazi party was also rather large before the war in the US.)

In all likelihood, the Brits would have been for dropping the bomb ASAP while the Russians would have sought delay. They wanted the opportunity to capture more Japanese holdings before the war ended. The Soviets wanted free access to the Pacific and were hoping Japan would be split much like Germany had been.

I am absolutely positive that future world politics was part of the decision making process for dropping the bomb. But I think the over riding factor for Truman was his responsibility (duty really) to prevent the loss of hundreds of thousands of American lives. I also think he saw that a decisive blow, as horrible as it would be, would save Japanese lives and infrastructure in the long run.

As I said earlier, no one in their right minds would volunteer to make a decision like that. Even if it is the right thing, even if there was no other real choice, you would still be signing the death warrant of thousands of people. It's impossible to imagine how much that has to weigh on someone's soul.

Splitter