Comment by Aurelius3

(Relatively) Low rates of foreign immigration despite ageing population, strong central goverment with the intention of weakening external and internal influences (See Uyghurs / western chinese territories for an example of internal influences, for external influences the great firewall is an obvious one, but there are many others), and third a general ethno-nationalist mentality from many, but not all Han chinese, encouraged by the central state and the general culture.