Other than the nuclear bomb, I'm just curious as to why they lost WW2.
Japan lost because they didn't have large petroleum resources nearby, and had to over-extend themselves. With sufficient petroleum, they would not have needed to expend into SE Asia, and thus would not have needed to attack the Americans in the Philippines and Pearl Harbor.
There were technical differences abound, but really both Japan and the US had nearly equivalent technology. They lost because of over-extension and oil.