In your dreams, and it wasn't Truman that defeated Japan it was President Roosevelt, Gen MacArthur and Adm Nimitz. Truman did not take over until the middle of April in 45, the war was all but over by then.
Roosevelt and company ignored the warnings on Japan.. planes in the air and Sunday morning... attack was horrible.
No matter what was going on ... it was Truman who had the guts to do the unthinkable. Not once, but twice. Japan would never have surrendered otherwise. They were on a world dominion.
They were called Japs and hated by the people in the US. That bombing they did that morning did wake a sleeping giant. It was years before Japan was thought of in a favorable fashion.
Items made in Japan back when.. were considered junk.
They got smart and made education important...
And they went tech all the way.
Today education is the #1 important item for Asian kids.