why do people in the north of acient china be protective by the great wall and why did they stop building the wall?how long is the wall of china nowand how did acient xian won more land and how high is the geat wall?
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why do people in the north of acient china be protective by the great wall and why did they stop building the wall?how long is the wall of china nowand how did acient xian won more land and how high is the geat wall?