Construction of the Great Wall started from seventy century BC. It began from the Spring, Autumn and Warring States Periods. At that time there were many kingdoms under the Zhou Dynasty. Each kingdom built its own wall around its territory for self-protection. The earliest Great Wall emerged in the Chinese history was the wall of Qi and Chu. In 221 BC Emperor Qinshihuang defeated the other six kingdoms and unified China. He ordered to link up the separated walls and extended them. It started from Lin Tao in the west to Liao Dong in the east, formed a 7,000 kilometers long wall. This became the first climax of building the Great Wall in Chinese history.

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