what was emperor qin shi's reason for restoring the older parts of the wall?

Question

what was emperor Qin Shi's reason for restoring the older parts of the wall?

Adam · Answer

The Qin fought nomadic tribes to the north and northwest. The Xiongnu tribes were not defeated and subdued, thus the campaign was tiring and unsuccessful, and to prevent the Xiongnu from encroaching on the northern frontier any longer, the emperor ordered the construction of an immense defensive wall.

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