Uyghurs
Contemporary scholars consider modern Uyghurs to be the descendants of a number of people, including the ancient Uyghurs of Mongolia who arrived at the Tarim Basin after the fall of the Uyghur Khaganate, Iranic Saka tribes, and other Indo-European peoples who inhabited the Tarim Basin before the arrival of the Turkic Uyghurs. DNA analyses indicate that the peoples of central Asia such as the Uyghurs are all mixed Caucasian and East Asian. Uyghur activists identify with the Tarim mummies, remains of an ancient people who inhabited the region, but research into the genetics of ancient Tarim mummies and their links with modern Uyghurs remains problematic, both to Chinese government officials concerned with ethnic separatism, and to Uyghur activists concerned that the research could affect their people's claim of being indigenous to the region.
Uyghur nationalism
During the First East Turkestan Republic, the Turkic nationalist ideology of the Republic led to hostility between different Muslim ethnic groups. The Uyghurs and Kirghiz, who were both Turkic Muslim peoples, fought against the Chinese Muslims of southern Xinjiang and sought to expel them with the Han Chinese. This led several Chinese Muslim Generals like Ma Zhancang, Ma Fuyuan, and Ma Hushan to fight against the Uyghur attempts and independence.