Question: Why did China need to resettle people into Yan Xing's birthplace?

full_context: Document 1: Sichuan: Sichuan has been historically known as the "Province of Abundance". It is one of the major agricultural production bases of China. Grain, including rice and wheat, is the major product with output that ranked first in China in 1999. Commercial crops include citrus fruits, sugar cane, sweet potatoes, peaches and grapes. Sichuan also had the largest output of pork among all the provinces and the second largest output of silkworm cocoons in 1999. Sichuan is rich in mineral resources. It has more than 132 kinds of proven underground mineral resources including vanadium, titanium, and lithium being the largest in China. The Panxi region alone possesses 13.3% of the reserves of iron, 93% of titanium, 69% of vanadium, and 83% of the cobalt of the whole country. Sichuan also possesses China's largest proven natural gas reserves, the majority of which is transported to more developed eastern regions.
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: 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 4: Franko B: Franko B (born in Milan in 1960) is an Italian performance artist based in London, where he has lived since 1979. He studied fine art at Camberwell College of Arts (1986–7), Chelsea College of Art (1987–90) and the Byam Shaw School of Art (1990–91). His work was originally based on the bloody and ritualised violation of his own body. Later on he embraced a wide variety of media including video, photography, painting, installation, and sculpture.
Document 5: 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 6: 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 7: 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 8: 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 9: Shi Jinsong: Shi Jinsong (born 1969, Dangyang County Hubei Province, China) is a Chinese artist based in Wuhan and Beijing. He studied at Hubei Academy of Fine Arts in China where he majored in sculpture and mastered an array of traditional styles and techniques. He graduated in 1994.
Document 10: 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 11: 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 12: Xing Xin: Xing Xin, (Chinese 幸鑫; born 25 May 1981, in Chongqing, China), is a contemporary Chinese artist based in Chengdu, Sichuan Province, China, involved in installation and performance art. Xing Xin started as a performance artist in 2003, with an academic background in sculpture, and is currently teaching performance art, video art, and installation in Sichuan Fine Arts Institute.
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: Yan Xing (artist): Yan Xing (Chinese characters: 鄢醒, born 1986) is an artist known for performance, installation, video and photography. He grew up in Chongqing and currently lives and works in Beijing and Los Angeles.
Document 15: Yuan Xikun: Yuan Xikun (born 1944 in Kunming, Yunnan Province) is a Chinese visual artist and environmental activist. In 2011, Yuan proposed building a giant sculpture composed of sand collected from five of earth's continents and water from its Arctic and Antarctic regions to draw attention to ozone depletion and climate change.
ground_truth: the Three Gorges Dam project.
sub_queries: Yan Xing >> place of birth Answer: Chongqing
Why did China need to resettle people into Chongqing ? Answer: the Three Gorges Dam project.