Three rivers should flow but not soil.

This policy was implemented in Yunnan in the Ming Dynasty. To be precise, it is a kind of control. "Tu" and "Liu" mentioned in the sentence are local officials (local ethnic minorities) and Liu officials (officials selected by the imperial court). The so-called three rivers refer to the Red River, Nujiang River and Lancang River in Yunnan. That is, the soil outside the Sanjiang area should not flow, that is, the officials outside the Sanjiang area should be held by local people; Within the scope of the three rivers, it is advisable to flow rather than soil, that is, the foreign ministers appointed by the court serve. This policy is actually very advanced and positive, which is very similar to our current system of regional ethnic autonomy. From here, we can also feel the continuous innovation of China feudal society in the governance system of minority areas.

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