fear of getting too big ... Case Study : Japan . Some bunch of Koreans driving roundeyes off islands nearby and making a tiny Civ or something . If adjacent on land , Japan is no trouble for the Middle Kingdom ; just send a million or two of troops and make them kowtow . But there were those two typhoons that sank invasion fleets twice . The thing to admit here is that having invented paper , the Chinese are quite prone to record things that happened and read them a couple of centuries later when they become relevant . So Japan becomes a case of let live and live . In awe of the Chinese culture , so hardly a threat , as the Chinese see the world around them .
then Zheng He and the massive fleets . Sent out to see what's around . Meant to raise vassals ; to act as a trip wire . In the truest Zheng He stuff , the Chinese are suspecting the Europeans might be shaking off their long slumber . In full contact with the Muslims , the Chinese know the Europeans stink , are hungry , numerous and have no respect whatsoever for culture , culture as defined by the Chinese or the Muslims . All the way to Africa , and no Europeans in sight . And Muslims have given up attempts invading China , ı don't know , since 750s ?
Zheng He says China could colonize ... Middle Kingdom confident of its superiorities , as proven by those voyages , foresees massive expansion . Any empire worth its name would assimilate its people and that massive expansion will mean in a couple of decades or centuries , the overseas possessions will see themselves worthy of "conquering" China . With a million or two of troops on the high seas ... Yeah , they could have been brought to their senses , but then the fickleness of the sea . All those obviously smart officials might get themselves drowned in some typhoon , right ? Better stay on dry land ... China is big enough anyhow .
then China's primary strategic threat is the nomadic horseman ; and history kinda shows the nomads were perfectly capable of copying the Chinese whenever it counted for something . This means a full scale Barbarian invasion and all those Confician scholars would have to spend a century or two to make all the invaders Chinese . So right here the connection to official history ; not profitable enough in view of the risks ... A decision all the European historians laugh at , because let me see , they stink and started reading like a millenia after the Chinese ...