Question: Why did China need to resettle people into Nan Lin's birthplace?

full_context: Document 1: Ronald Breiger: Ronald Breiger is an American sociologist and a Regents' Professor, a professor of sociology and (by courtesy) government and public policy, and an affiliate of the interdisciplinary graduate program in statistics at the University of Arizona. Prior to coming to Arizona he served on the faculties of Harvard University (assistant to associate professor) and Cornell University (professor to Goldwin Smith Professor of Sociology). He is well cited in the fields of social networks, social stratification, mathematical sociology, organizational sociology and cultural sociology and, with Linton Freeman, edited the influential academic journal "Social Networks" from 1998 to 2006. In 2005 he was the recipient of the Georg Simmel Distinguished Career Award of the International Network for Social Network Analysis, and in 2018 he received the James S. Coleman Distinguished Career Achievement Award of the American Sociological Association Section on Mathematical Sociology.
Document 2: 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 3: 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 4: 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 5: David Lin: David Lin graduated with a bachelor and master of commerce degree from the National Chengchi University in Taiwan. He earned his master of science degree from Georgetown University in the United States.
Document 6: Tan Chung: Tan Chung taught at Jawaharlal Nehru University (JNU) and the University of Delhi for many years. His father, Tan Yunshan (1898-1983), was the Founding Director of the Department of Chinese Language and Culture "Cheena-Bhavana" at Visva-Bharati University, Santiniketan and a key figure driving Nationalist China's interactions with the Indian freedom movement during the 1930s and 1940s. After Tan Chung's retirement from JNU in 1994, he worked as a Research Professor at Indira Gandhi National Centre for the Arts, New Delhi and currently lives in Chicago, United States. He has been Honorary Director of the ICS/Institute of Chinese Studies, New Delhi.
Document 7: Tan Suee Chieh: Tan Suee Chieh’s directorships include International Cooperative and Mutual Insurance Federation and Allnations Board. Tan Suee Chieh is also the Co-chairman of the Institute of Service Excellence@SMU, Vice Chairman of the Singapore Children’s Society Executive Committee, a member of the Board of Governors of the Asia Pacific Risk and Insurance Association, Advisory Board Member of the Centre for Strategic Leadership at National University of Singapore and Sim Kee Boon Institute for Financial Economics at Singapore Management University, and Trustee of the Singapore London School of Economics (LSE) Trust.
Document 8: 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 9: 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 10: Nanjing: Located in Yangtze River Delta area and the center of East China, Nanjing is home to one of the world's largest inland ports. Nanjing is also one of the fifteen sub-provincial cities in the People's Republic of China's administrative structure, enjoying jurisdictional and economic autonomy only slightly less than that of a province. Nanjing has been ranked seventh in the evaluation of "Cities with Strongest Comprehensive Strength" issued by the National Statistics Bureau, and second in the evaluation of cities with most sustainable development potential in the Yangtze River Delta. It has also been awarded the title of 2008 Habitat Scroll of Honour of China, Special UN Habitat Scroll of Honour Award and National Civilized City. Nanjing boasts many high-quality universities and research institutes, with the number of universities listed in 100 National Key Universities ranking third, including Nanjing University. The ratio of college students to total population ranks No.1 among large cities nationwide. Nanjing is one of the three Chinese top research centres according to Nature Index.
Document 11: 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 12: Fei Xiaotong: Fei Xiaotong or Fei Hsiao-Tung (November 2, 1910 – April 24, 2005) was a Chinese anthropologist and sociologist. He was a pioneering researcher and professor of sociology and anthropology; he was also noted for his studies in the study of China's ethnic groups as well as a social activist. One of China's finest sociologists and anthropologists, his works on these subjects were instrumental in laying a solid foundation for the development of sociological and anthropological studies in China, as well as in introducing social and cultural phenomena of China to the international community. His last post before his death in 2005 was as Professor of Sociology at Peking University.
Document 13: 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 14: Nan Lin: Nan Lin (born 1938 in Chongqing, China) is the Oscar L. Tang Family Professor of Sociology of the Trinity College, Duke University. He is most notable for his research and writing on social networks and social capital.
Document 15: Kieran Healy: Kieran Healy is an Irish sociologist, an associate professor of sociology at Duke University, a member of the Kenan Institute for Ethics at Duke, and a regular visitor to the Research School in Social Science (RSSS) at the Australian National University. He earned his PhD in sociology from Princeton University having begun his studies at University College Cork, in Ireland. His research interests include the social basis of self-interest and altruism, and the organization of exchange in human goods (like blood, organs, eggs and genetic material) and the role of volunteering in the open source software movement. In 2002, he was awarded the American Sociological Association's Dissertation Award for "Exchange in Blood and Organs."
ground_truth: the Three Gorges Dam project.
sub_queries: Nan Lin >> place of birth Answer: Chongqing
Why did China need to resettle people into Chongqing ? Answer: the Three Gorges Dam project.