So, I've often seen questions about "How to get China to colonize the Americas", and the main reason they can't is that a central part of Chinese society (at least in terms of countries and states) is that the Middle Kingdom is the best ever and that all other barbarians are stupid. But it obviously wasn't always lie this. The Qin conquered, and the Han annexed the southern parts of China (Canton?). How come that didn't continue in the Imperial Dynasties that were native Han(the Qing and Yuan were conquerors by default)? Where did the idea to literally not expand the Middle Kingdom originate? And how could we change that?