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Mongol tribal denominations is a weak argument. In the old days, tribal belonging was not set in stone, especially on the Eurasian steppes. Weaker tribes often adopted the names of stronger ones. Forefathers of Genghis Khan who came from Amur region to Mongolia intermixed with Turkics on the way. Naimans, Kereits, Tatars (sekiz Tatar/Toquz Tatar/Otuz Tatar) most likely spoke a Turco-Mongol creole, and we know that Naimans in fact outnumbered Mongols in late 13th century. Plus most Mongols (that is Ghengis Khan's warriors) perished in large numbers during various campaigns, replaced by largely Turkic local nomads. Genetic impact of Mongols is likely very low, but Mongols obviously changed the demographic balance in Central Asia. Ghengis Khan's invasion of Khwarezm and annihilation of Kipchaks was a matter of honor. Agreement was sealed between Khwarezm Shah and Genghis Khan, that the shah retains the west and the khan keeps the east. However Kipchaks, who were mercenaries of Khwarezm seized and plundered Khan's caravan heading for Otrar which led to casus belli and the commencement of western campaigns culminating in the slaughter of large number of Persian speaking citizens of Sogdiana.
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