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How many nationalities have there been in China since ancient times? What are those?

Achang, Bai, Baoan, Bulang, Buyi, Korean, Daur, Dai, De 'ang, Dong, Dongxiang, Dulong, Oroqen, Russian, Ewenki, Gaoshan, Gelao, Hani, Kazak, Hezhe, Hui and Jino. Qiang, Salar, She, Shui, Tajik, tatar people, Tu, Tujia, Wa, Uygur, Uzbek, Xibe, Yao, Yi, Yugur, Tibetan and Zhuang.