Do you mean what would happen if Japan invaded instead of just bombing? Well there would be a bloody battle for Hawaii. Japan would get Hawaii for a little while but America would strike back with a vengeance. I think we'd still win the war but it would take longer because we'd have to run the Japanese out of Hawaii first. In the end we'd probably even nuke them the same way. The only things that would change is that the fighting would be even bloodier and the war would last longer with Japan.