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In page Sichuan:

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In 263, the Cao Wei of North China conquered the Kingdom of Shu-Han as a step on the path to reuniting China. Salt production becomes a major business in Ziliujing District. During the Six Dynasties period of Chinese disunity, Sichuan began to be populated by non-Han ethnic minority peoples, owing to the migration of Gelao people from the Yunnan–Guizhou Plateau to the Sichuan basin.[citation needed]