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When were Shaanxi and Gansu separated into different provinces under the Qing dynasty?

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Under the Qing dynasty, Shaanxi and Gansu were separated into distinct provinces in 1666.1

Prior to this separation, Shaanxi had incorporated Gansu to the west under Ming dynasty rule. Following the 1666 division, the two regions were often administered together under a governor-general of Shaanxi-Gansu, who was stationed at Lanzhou and held authority over both provinces.12