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A wonder of the world Great Wall China …

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The Great Wall of China is the collective name of a series of  fortification  systems generally built across the historical northern borders of China  to protect and consolidate territories of Chinese states  and empires against various nomadic groups   of the steppe and their polities. Several walls were being built from as early as the 7th century BC by ancient Chinese states; selective stretches were later joined together by Qin shi Huang  (220–206 BC), the first Emperor of China. Little of the Qin wall remains. Later on, many successive dynasties have built and maintained multiple stretches of border walls. The most well-known sections of the wall were built by the Ming dynasty   (1368–1644).
Apart from defense, other purposes of the Great Wall have included border controls , allowing the imposition of duties on goods transported along the  silk Road , regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watch towers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor.
The frontier walls built by different dynasties have multiple courses. Collectively, they stretch from Liaodong in the east to Lop Lake in the west, from the present-day Sino Russian border in the north to Taohe River in the south; along an arc that roughly delineates the edge of Mongolian steppe. A comprehensive archaeological survey, using advanced technologies, has concluded that the walls built by the Ming dynasty measure 8,850 km (5,500 mi). This is made up of 6,259 km (3,889 mi) sections of actual wall, 359 km (223 mi) of trenches and 2,232 km (1,387 mi) of natural defensive barriers such as hills and rivers. Another archaeological survey found that the entire wall with all of its branches measures out to be 21,196 km (13,171 mi). Today, the defensive system of the Great Wall is generally recognized as one of the most impressive architectural feats in history.
Huayi tu  1136 map of China with the Great Wall depicted on the northern edge of the country
The collection of fortifications known as the Great Wall of China has historically had a number of different names in both Chinese and English.
In Chinese histories , the term “Long Rampart(s)” appears in Sima Qian’s Records of the Grand Historian.  where it referred both to the separate great walls built between and north of the Warring states  and to the more unified construction of the First emperor.  The Chinese Character , meaning city or fortress, is a Phono sematic compound of the  earth radical and phonetic , whose Old chinese pronunciation has been reconstructed . It originally referred to the rampart which surrounded traditional chinese cities and was used by extension for these walls around  their respective states; today, however, it is much more often the Chinese word for “city”.
The longer Chinese name “Ten-Thousand Mile Long Wall”, Wanli Changcheng) came from Sima Qian’s description of it in the Records, though he did not name the walls as such. The ad 493 Book of the sound quotes the frontier general Tan Daoji referring to “the long wall of 10,000 miles”, closer to the modern name, but the name rarely features in pre-modern times otherwise. The traditional chinese mile was an often irregular distance that was intended to show the length of a standard village and varied with terrain but was usually srandardized   at distances around a third of an English  (540 m).  Since China’s metrication in 1930, it has been exactly equivalent to 500 metres or 1,600 feet, which would make the wall’s name describe a distance of 5,000 km (3,100 mi). However, this use of “ten-thousand” is figurative in a similar manner to the Greek and English myriad  and simply means “innumerable” or “immeasurable”.
Because of the wall’s association with the First Emperor’s supposed tyranny, the Chinese dynasties after Qin usually avoided referring to their own additions to the wall by the name “Long Wall”. Instead, various terms were used in medieval records, including “frontier(s)”rampart(s)” ,, “barrier(s)”,  “the outer fortresses”, and “the border wall(s)” .  Poetic and informal names for the wall included “the Purple Frontier” and “the Earth Dragon”.  Only during the Qing period  did “Long Wall” become the catch-all term to refer to the many border walls regardless of their location or dynastic origin, equivalent to the English “Great Wall”.
The current English name evolved from accounts of “the Chinese wall” from early modern European travelers. By the 19th century, “The Great Wall of China” had become standard in English and French, although other European languages such as German continue to refer to it as “the Chinese wall”.
History of Great wall of China
The great wall of the Qin stretches from Lintao to Liaodong
The Chinese were already familiar with the techniques of wall building by the time of the spring and autumn  between the 8th and 5th centuries BC. During this time and the subsequent warring states period , the states of  Qin , wei, zhao. Qi , han, yan and zhongshan all constructed extensive fortifications to defend their own borders. Built to withstand the attack of small arms such as swords and spears, these walls were made mostly by stone or stamping earth and gravel between board frames.
The Great wall of the han is the longest of all walls, from Mamitu near Yumenguan to Liaodong.  
King Zheng of Qin conquered the last of his opponents and unified China as the First Empero of the Qin dynasty (“Qin Shi Huang”) in 221 BC. Intending to impose centralized rule and prevent the resurgence of feudal lords, he ordered the destruction of the sections of the walls that divided his empire among the former states. To position the empire against the Xiongnu people from the north, however, he ordered the building of new walls to connect the remaining fortifications along the empire’s northern frontier. “Build and move on” was a central guiding principle in constructing the wall, implying that the Chinese were not erecting a permanently fixed border. Transporting the large quantity of materials required for construction was difficult, so builders always tried to use local resources. Stones from the mountains were used over mountain ranges, while rammed  earth  was used for construction in the plains. There are no surviving historical records indicating the exact length and course of the Qin walls. Most of the ancient walls have eroded away over the centuries, and very few sections remain today. The human cost of the construction is unknown, but it has been estimated by some authors that hundreds of thousands if not up to a million, workers died building the Qin wall. Later, the Han,  the Northern Dynasties and the sui  all repaired, rebuilt, or expanded sections of the Great Wall at great cost to defend themselves against northern invaders. The Tang and song dynasties did not undertake any significant effort in the region. Non-Han dynasties also built their border walls: the xianbei –ruled Northern wei, the khitan -ruled Loap, Jurchen,Jin and the Tangut-established western xia, who ruled vast territories over Northern China throughout centuries, all constructed defensive walls but those were located much to the north of the other Great Walls as we know it, within China’s province of  inner mongolia and in mongolia itself.  
The extent of the Ming Empire and its walls
The Great Wall concept was revived again under the Ming in the 14th century,  and following the Ming army’s defeat by the Oirats  in the Battle of Tumu . The Ming had failed to gain a clear upper hand over the Mongolian  tribes after successive battles, and the long-drawn conflict was taking a toll on the empire. The Ming adopted a new strategy to keep the nomadic tribes out by constructing walls along the northern border of China. Acknowledging the Mongol control established in the Ordos Desert , the wall followed the desert’s southern edge instead of incorporating the bend of the Yellow River.
Unlike the earlier fortifications, the Ming construction was stronger and more elaborate due to the use of bricks and stone instead of rammed earth. Up to 25,000 watchtowers are estimated to have been constructed on the wall. As Mongol raids  continued periodically over the years, the Ming devoted considerable resources to repair and reinforce the walls. Sections near the Ming capital of Beijing were especially strong.Qi jiguang between 1567 and 1570 also repaired and reinforced the wall, faced sections of the ram-earth wall with bricks and constructed 1,200 watchtowers from Shanhaiguan Pass to Changping to warn of approaching Mongol raiders. During the 1440s–1460s, the Ming also built a so-called “Liaodong Wall”. Similar in function to the Great Wall (whose extension, in a sense, it was), but more basic in construction, the Liaodong Wall enclosed the agricultural heartland of the Liaodong province, protecting it against potential incursions by Jurched-Mongol Oriyanghan from the northwest and the jianzhou jurchens  from the north. While stones and tiles were used in some parts of the Liaodong Wall, most of it was in fact simply an earth dike with moats on both sides.
Towards the end of the Ming, the Great Wall helped defend the empire against the Manchu  invasions that began around 1600. Even after the loss of all of Liaodong, the Ming army held the heavily fortified Shanhai pass, preventing the Manchus from conquering the Chinese heartland. The Manchus were finally able to cross the Great Wall in 1644, after Beijing had already fallen to Li Zicheng’s ‘s rebels. Before this time, the Manchus had crossed the Great Wall multiple times to raid, but this time it was for conquest. The gates at Shanhai Pass were opened on May 25 by the commanding Ming general, Wu sangui who formed an alliance with the Manchus, hoping to use the Manchus to expel the rebels from Beijing. The Manchus quickly seized Beijing, and eventually defeated both the rebel-founded Shun dynasty and the ramaining ming resistance, establishing the Qing dynasty rule over all of China.
Under Qing rule, China’s borders extended beyond the walls and Mongolia was annexed into the empire, so constructions on the Great Wall were discontinued. On the other hand, the so-called Willow palisade, following a line similar to that of the Ming Liaodong Wall, was constructed by the Qing rulers in Manchuria. Its purpose, however, was not defense but rather to prevent Han Chinese migration into Manchuria.
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