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Kind of a complicated question. What would a empire need for it to be able to conquer the world? I'm not talking about an OTL empire, I'm talking from a perspective of a theoretical one. There's a reason why some empires and nations are able to expand rapidly and some aren't. So what would an empire have to be like if it were to be given a shot at expanding across the world. What are the "all-star" traits needed for an empire to have a chance?