Here’s another account of what an invasion of Japan would likely have looked like:
http://www.webwizpro.com/1945InvasionofJapan.html
Would have made Verdun, the Somme and “The Russian Front”, combined, look like a mild dispute in a convent.
Ah, but don’t foget Europe!
As soon as the US and British armies, supplies, and supply ships and supply dumps were “transferred” from the European front lines (essentially where they were already “opposing” Soviet armies far larger then the US local forces) back across the Atlantic, back across the US continent and then back across the Pacific -
Stalin would have been able to “stabilize” a war-torn and disarmed Germany immediately all the way to the French border. And the French socialist unions and strikers and Vichy government wold have turned France into a Yugoslav or Polish client state.