I think Hitler would have been happy to have peace with us, until he controlled all of Europe and Russia that is. Then we would have been next on the list and would have had to fight him alone since the countries that ended up being allies would have been beaten or at least weakened a lot. Japan thought they were doing a good thing for their side in Pearl Harbor, but it backfired on them in the long run. Who knows how WWII would have turned out if Japan didn't attack us and we stayed in isolation for a couple of years longer.