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When did the Qin empire incorporate the region south of the Huang He into its territory?

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Huang He; Ningxia — Ningxia Huang He (Yellow River) in Hui Autonomous Region of Ningxia, north-central China.

The region south of the Huang He was incorporated into the Qin empire during the 3rd century BCE. During this period, the construction of walls throughout the area was undertaken to solidify control.1