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Great Wall of China and in the Badaling area passes in the immediate vicinity of Beijing. According to other sources The length of the wall from edge to edge is 21,196 kilometers. The thickness of the Great Wall is mainly about 5-8 meters and the height is usually about 6-7 meters.

Construction of the first sections of the wall began in the III century during the period of the Warring States to protect the state from the Hsiung-nu. The construction involved a fifth of the population lived then about one million people. The wall was clearly to fix the boundaries of the Chinese civilization to promote the consolidation of a unified empire had just made up of a number of conquered kingdoms.

Developed on the plain of central China, populated areas turning into large trade centers attracted the attention of nomads who often attacked them raiding because of the Yinhan. Large kingdoms such as Qin Wei Yan Zhao whose borders were located in the north made attempts to build protective walls. These walls were clay structures. The Kingdom of Wei erects the wall around 353 Which served as a boundary with the Qin kingdom the kingdom of Qin and Zhao build a wall about 300 And the kingdom of Yan about 289. The disparate structures of the walls later unite and form a single structure.

During the reign of Emperor Qin Shihuandi the empire is united into a single whole reaches unprecedented power. As never before she needs reliable protection from nomadic peoples. Qin Shi-huandi gives the order for the construction of the Great Wall of China along the Ying Shan. During construction the previously existing parts of the wall are used which are strengthened, built up joined by new areas and lengthened the same sections that previously separated separate kingdoms are demolished. The construction of the wall was appointed to govern the commander of Meng Tian.

Construction lasted 10 years and faced many difficulties. The main problem was the lack of adequate infrastructure for construction: there were no roads there was no adequate water and food for those involved in the works while their number reached 300 thousand people and the total number of builders employed by Qin reached according to some estimates 2 million. Slaves soldiers peasants were involved in the construction. As a result of epidemics and overwork at least tens of thousands of people died. The outrage of mobilization for the construction of the wall caused popular uprisings and was one of the reasons for the fall of the Qin Dynasty.

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