“Japan, I think he would have dropped the bomb, maybe sooner, who knows.”
The bomb wasn’t ready sooner... the U.S. was down to the wire on everything with those two nuclear devices. The power required, the technology at the time excetera... We used every scrap of nuclear material that could be made for the testing and the two bombs that were delivered and dropped. In fact we were not sure the second bomb, which was a different triggering mechanism, was going to work at all because it had not been tested.
So... history decided the timeline and it looks like we dropped those bombs on Japan when they were ready. It really came down to the wire and was the epitome of a just-in-time production run. With no backup or follow-on to fall back upon.
“... in‘39, war raised it’s ugly head”
I think historians generally agree now that WWII actually started when Japan invaded China, which was around 31. Or roughly 10 years before the Blitzkrieg of Poland and the annexation of Czechoslovakia which was Chamberlain’s claim to fame... and it meant the subjugation of the whole peoples of Czechoslovakia, for some reason Britain deemed itself the master of Czechoslovakia and turn it over to Nazi Germany without so much as a stone being tossed.