Question: Why did China need to resettle people into the city where Xu was born?

full_context: Document 1: Xu Bing: Born in Chongqing in 1955, Xu grew up in Beijing. His father was the head of the history department at Peking University. In 1975, near the end of the Cultural Revolution, he was relocated to the countryside for two years as part of Mao Zedong's "re-education" policy. Returning to Beijing in 1977, he enrolled at the Central Academy of Fine Arts(CAFA) where he joined the printmaking department and also worked during a short period of time as a teacher, receiving his Masters in Fine Art in 1987. After the Tiananmen Square Protests of 1989 his recent work came under scrutiny from the government and received harsh criticism for what was perceived as a critique of the Chinese government. Due to the political pressure and artistic restrictions of the post-Tiananmen period in China, Xu Bing, like many of his contemporaries, moved to the United States in 1990 where he was invited by the University of Wisconsin–Madison. He then resided to the United States until his appointment as vice-president of the Beijing CAFA in 2008.
Document 2: Sichuan: In the middle of the 17th century, the peasant rebel leader Zhang Xianzhong (1606–1646) from Yan'an, Shanxi Province, nicknamed Yellow Tiger, led his peasant troop from north China to the south, and conquered Sichuan. Upon capturing it, he declared himself emperor of the Daxi Dynasty (大西王朝). In response to the resistance from local elites, he massacred a large native population. As a result of the massacre as well as years of turmoil during the Ming-Qing transition, the population of Sichuan fell sharply, requiring a massive resettlement of people from the neighboring Huguang Province (modern Hubei and Hunan) and other provinces during the Qing dynasty.
Document 3: Liang Congjie: Liang's father, architect Liang Sicheng, had led attempts to prevent the destruction of the walls surrounding Beijing with the land to be used for the construction of highways. His grandfather Liang Qichao spent 14 years in exile in Japan after he advocated on behalf of turning the Qing Dynasty into a constitutional monarchy. His ancestry came to haunt him during the Maoist Cultural Revolution when he was purged for his being the "grandson of China's biggest royalist". Liang was ultimately able to attend Peking University.
Document 4: Sichuan: Sichuan consists of two geographically very distinct parts. The eastern part of the province is mostly within the fertile Sichuan basin (which is shared by Sichuan with Chongqing Municipality). The western Sichuan consists of the numerous mountain ranges forming the easternmost part of the Qinghai-Tibet Plateau, which are known generically as Hengduan Mountains. One of these ranges, Daxue Mountains, contains the highest point of the province Gongga Shan, at 7,556 metres (24,790 ft) above sea level.
Document 5: Sichuan: In the 20th century, as Beijing, Shanghai, Nanjing, and Wuhan had all been occupied by the Japanese during the Second Sino-Japanese War, the capital of the Republic of China had been temporary relocated to Chongqing, then a major city in Sichuan. An enduring legacy of this move is that nearby inland provinces, such as Shaanxi, Gansu, and Guizhou, which previously never had modern Western-style universities, began to be developed in this regard. The difficulty of accessing the region overland from the eastern part of China and the foggy climate hindering the accuracy of Japanese bombing of the Sichuan Basin, made the region the stronghold of Chiang Kai-Shek's Kuomintang government during 1938-45, and led to the Bombing of Chongqing.
Document 6: Tang Baiqiao: Tang Baiqiao (; born 11 August 1967, Yongzhou; sometimes spelled "Tang Boqiao") is a Chinese political dissident from Hunan province who led student protests during the 1989 democracy movement. After the incident at Tiananmen Square, Tang fled from agents of the Communist Party of China who eventually arrested him in the city of Jiangmen. He was charged with being a counter-revolutionary and imprisoned. Upon his release, he fled to Hong Kong, where he co-authored the report "Anthems of Defeat: Crackdown in Hunan Province 1989 - 1992" through Human Rights Watch with Dr. Robin Munro of the University of London. Tang was later accepted into the United States as a political refugee in 1992. Tang claimed that he graduated in 2003 with a Master's degree in international affairs from Columbia University, but university archive and registrar of Columbia University claimed that he studied there but did not graduate.
Document 7: Sichuan: The Three Gorges Dam, the largest dam ever constructed, is being built on the Yangtze River in nearby Hubei province to control flooding in the Sichuan Basin, neighboring Yunnan province, and downstream. The plan is hailed by some as China's efforts to shift towards alternative energy sources and to further develop its industrial and commercial bases, but others have criticised it for its potentially harmful effects, such as massive resettlement of residents in the reservoir areas, loss of archeological sites, and ecological damages.
Document 8: Zeng Fanzhi: Zeng Fanzhi (; born 1964) is a contemporary Chinese artist based in Beijing. From the earliest stages of his career, his paintings have been marked by their emotional directness, the artist's intuitive psychological sense, and his carefully calibrated expressionistic technique. Moving to Beijing in the early 1990s, Zeng's art displayed an immediate shift, responding to his immersion in a more superficial environment, his seminal Mask series displaying the tensions between the artist's dominant existential concerns and an ironic treatment of the pomposity and posturing inherent to his new contemporary urban life. Throughout, Zeng's expressionistic techniques run counter to such techniques' conventional usage. That is, Zeng's representation of raw, exposed flesh or awkwardly oversized hands is not an attempt at pure emotional expression, but instead play against the superficially composed appearances of his subjects, an ironic treatment of emotional performance as a metaphor for a lost self, of stunted self-realization.
Document 9: Xiao Qiang: A theoretical physicist by training, he studied at the University of Science and Technology of China and entered the PhD program (1986–1989) in Astrophysics at the University of Notre Dame. He became a full-time human rights activist after the Tiananmen Massacre in 1989. Xiao was the Executive Director of the New York-based NGO Human Rights in China from 1991 to 2002 and vice-chairman of the steering committee of the World Movement for Democracy.
Document 10: Wu'erkaixi: He was born in Beijing on February 17, 1968 with ancestral roots in Ili Kazakh Autonomous Prefecture, Xinjiang. He achieved prominence while studying at Beijing Normal University as a hunger striker who rebuked Chinese Premier Li Peng on national television. He was one of the main leaders of the pro-reform Beijing Students' Autonomous Federation, and helped lead abortive negotiations with officials.
Document 11: Zhou Ji: Zhou is a native of Shanghai, and attended Tsinghua University in Beijing, where he graduated from in 1970, and received M.E. degree in mechanical engineering from Huazhong University of Science and Technology in 1980. Zhou also acquired a doctorate from the University at Buffalo, The State University of New York (PhD, '84, M.S.'81) in the United States. Much of his early career was spent at the Huazhong University of Science and Technology in Wuhan, where he eventually rose to become the president of [Huazhong University of Science and Technology]] in 1997. He was elected as the fellow of the Chinese Academy of Engineering in 1999. He then spent a tenure in the municipal government of Wuhan, where he served as deputy mayor and Mayor.
Document 12: Sichuan: From 1955 until 1997 Sichuan had been China's most populous province, hitting 100 million mark shortly after the 1982 census figure of 99,730,000. This changed in 1997 when the Sub-provincial city of Chongqing as well as the three surrounding prefectures of Fuling, Wanxian, and Qianjiang were split off into the new Chongqing Municipality. The new municipality was formed to spearhead China's effort to economically develop its western provinces, as well as to coordinate the resettlement of residents from the reservoir areas of the Three Gorges Dam project.
Document 13: Sichuan: Sichuan was China's most populous province before Chongqing became a directly-controlled municipality; it is currently the fourth most populous, after Guangdong, Shandong and Henan. As of 1832, Sichuan was the most populous of the 18 provinces in China, with an estimated population at that time of 21 million. It was the third most populous sub-national entity in the world, after Uttar Pradesh, India and the Russian Soviet Federative Socialist Republic until 1991, when the Soviet Union was dissolved. It is also one of the only six to ever reach 100 million people (Uttar Pradesh, Russian RSFSR, Maharashtra, Sichuan, Bihar and Punjab). It is currently 10th.
Document 14: Sichuan: The majority of the province's population is Han Chinese, who are found scattered throughout the region with the exception of the far western areas. Thus, significant minorities of Tibetan, Yi, Qiang and Nakhi people reside in the western portion that are impacted by inclement weather and natural disasters, environmentally fragile, and impoverished. Sichuan's capital of Chengdu is home to a large community of Tibetans, with 30,000 permanent Tibetan residents and up to 200,000 Tibetan floating population. The Eastern Lipo, included with either the Yi or the Lisu people, as well as the A-Hmao, also are among the ethnic groups of the provinces.
Document 15: Shi Tiesheng: In 1969 he was a "sent-down youth" or urban youth sent to a rural area of Shaanxi as part of the Down to the Countryside Movement of the Cultural Revolution. There he was paralyzed in an accident at the age of 21, and was sent back to Beijing.
ground_truth: the Three Gorges Dam project.
sub_queries: Where was Xu born at? Answer: Chongqing
Why did China need to resettle people into Chongqing ? Answer: the Three Gorges Dam project.