Answered by Mr.dzhoyan
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Apr. 08, 2009 22:54
Before Qin Danasty(established in 221 BC),there were a lot of vassals in Zhou Danasty.To prevent the enemies from north,some vassals started to build the Greatwall separately.The time was about 500 BC.When Qin Danasty was established,the First Emperor of Qin Danasty ,mobilized more than 1 million people to join these defensive walls together.