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As you may know, in the 80s before the japanese economy crashed, many thought that Japan would become a global superpower, with it's language and culture spreading all over the world. However, the aforementioned economic crash lead to a "Lost Decade" and currently Japan is facing a demographic crisis due to a rapidly aging population-- not exactly superpower material. So, without any ASBs, and with a POD after surrender in 1945, how can you have Japan be as economically and politically dominant as possible?