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In page Racism in China:

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According to the Central Asia-Caucasus Institute's founder S. Fredrick Starr, tensions between Hui and Uyghurs arose because the Qing and Republican Chinese authorities both used Hui troops and officials to dominate the Uyghurs and suppress Uyghur revolts.[21] The massacre of Uyghurs by Ma Zhongying's Hui troops in the Battle of Kashgar caused unease as more Hui moved into the region from other parts of China.[22] Per Starr, the Uyghur population grew by 1.7 percent in Xinjiang between 1940 and 1982, and the Hui population increased by 4.4 percent, with the population-growth disparity serving to increase interethnic tensions.[citation needed]