Examine the defensive walls on Map 6.1,China under the Qin dynasty,221-207B.C.E.Why were they constructed in the north? Were there reasons for constructing the walls other than purely defensive ones?

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The Answer of Examine the defensive walls on Map 6.1,China under the Qin dynasty,221-207B.C.E.Why were they constructed in the north? Were there reasons for constructing the walls other than purely defensive ones?

Examine the Defensive Walls on Map 6