what dynasty completed the great wall of china
Qin Ming dynasty Qing
title: History of the Great Wall of China text: History of the Great Wall of China The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771–476) and Warring States periods (475–221) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221–206) against incursions by nomads from Inner Asia. The walls were built of rammed earth, constructed using forced labour, and by 212 ran from Gansu to the coast of southern Manchuria. Later dynasties adopted different policies towards northern frontier defense. The Han (202 – 220), the Northern Qi (550–574), title: Great Wall of China text: time and the subsequent Warring States period, the states of Qin, Wei, Zhao, Qi, 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 stamping earth and gravel between board frames. King Zheng of Qin conquered the last of his opponents and unified China as the First Emperor 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 title: History of the Great Wall of China text: north of Nong'an County to the banks of the Songhua River. When the Jurchens, once Liao vassals, rose up to overthrow their masters and established the Jin dynasty, they continued Liao's wall-building activities with extensive work begun before 1138. Further wall construction took place in 1165 and 1181 under the Jin Emperor Shizhong, and later from 1192 to 1203 during the reign of his successor Emperor Zhangzong. This long period of wall-building burdened the populace and provoked controversy. Sometime between 1190 and 1196, during Zhangzong's reign, the high official Zhang Wangong (張萬公) and the Censorate recommended that work on the title: Great Wall of China text: undertake any significant effort in the region. The Liao, Jin, and Yuan dynasties, who ruled Northern China throughout most of the 10th–13th centuries, constructed defensive walls in the 12th century but those were located much to the north of the Great Wall as we know it, within China's province of Inner Mongolia and in Mongolia itself. 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 title: Great Wall of China text: 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 Sui, and the Northern dynasties 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