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I'm thinking of something along the lines of Mahakhitan where some Sinicized nomads conquer an area (and possible displace a bunch of natives) and settle down to form their own little Chinese empire. Could areas like Persia, the Caucasus, or Western Russia be good for this purpose or are they too foreign for long-term settlement? What kind of nomad:native ratio would you need for the settlers to survive without being assimilated immediately and/or have a long term impact on the culture of the area.
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