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after Qin conquered all opposing states and unified China he establishing the Qin Dynasty. He ordered the destruction of the wall sections that divided his empire along the former state borders and to protect the empire against intrusions by the Xiongnu people from the north. He then ordered his people to build a new wall to connect it to the other side. The materials used for construction was local resources, stones from the mountains and rammed earth.
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The kept building the Wall along with repairing it
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The Great Wall was extended from the Yalu River in Liaoning Province to the eastern bank of the Taolai River in Gansu Province. Emperor Ming's Great Wall winds its way from east to west through present Liaoning, Hebei, Tianjin, Beijing, Inner Mongolia, Shanxi, Shaanxi, Ningxia and Gansu Provinces or areas
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