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The basic history everyone gets taught hardly shows the entire picture. To truly understand even a part of that picture you need to read more in depth research than just "A short history of nearly everything" or your average history school book.

The 'treaty' between Japan and Germany wasn't the same treaty as the treaties we saw in the years before World War I. They weren't bound together by mutual obligations, not in the slightest. I think it's safe to say Hitler's warmachine paid little or no attention to what happened with Hirohito in Asia.