Question: Why did China need to resettle people in the place where Liangping District is located?

full_context: Document 1: Kunming Changshui International Airport: Kunming Changshui International Airport (IATA: KMG, ICAO: ZPPP) is the primary airport serving Kunming, the capital of Yunnan Province, China. The airport is located 24.5 km (15.2 mi) northeast of the city center in a graded mountainous area about 2,100 m (6,900 ft) above sea level. The airport opened at 08:00 (UTC+8) on June 28, 2012, replacing the old Kunming Wujiaba International Airport, which will be demolished. As a gateway to Southeast and South Asia, Changshui Airport is a hub for China Eastern Airlines, Kunming Airlines, Lucky Air, Sichuan Airlines and Ruili Airlines.
Document 2: Liangping Airport: Liangping Airport () , also called Wanzhou Liangping Airport, is a former dual-use military and civil airport, located west of Liangping (formerly called Liangshan) in Chongqing Municipality, China. It served the city of Wanxian (now Wanzhou District) from July 1988 until May 2003, when all civil flights were transferred to the new Wanzhou Wuqiao Airport.
Document 3: Lincang Airport: Lincang Airport is an airport serving the city of Lincang in Yunnan province, southwestern China. The airport started operation on March 25, 2001. The airport is 22.5 km from the center of the city in the town of Boshang.
Document 4: 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 5: 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 6: 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 7: 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 8: Yubei District: Yubei District (), literally means "the north of Yu (the abbreviation for Chongqing)", is a district of Chongqing municipality, bordering Sichuan province to the north. Lianglu, which is a town administered by Yubei District, is where the Chongqing Jiangbei International Airport is located.
Document 9: 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 10: Chinquapin Airport: Chinquapin Airport was closed, the property sold in 1948 and the land was redeveloped into a housing development. The hangars at the airport were moved to the new airport. The runways were subsequently converted into streets. One runway is now Marietta Drive, and the other is Westgate Drive, with houses built along each side of the streets.
Document 11: 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 12: 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 13: Xichang Qingshan Airport: Xichang Qingshan Airport () is an airport serving Xichang, the capital city of Liangshan Yi Autonomous Prefecture in Sichuan Province, China. The airport started an expansion project in February 2010.
Document 14: 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 15: Hengchun Airport: Due to its location, the airport frequently experiences strong katabatic winds and is forced to close. Because of this, the load factor of the flights rarely exceeds 40%; airlines are considering filing applications for withdrawal of services to Hengchun. Scheduled flights ceased in September 2014. In late May 2019, Taiwanese carrier, Uni Air has announced that they will be officially ending flights from Taipei Songshan Airport to Hengchun after they suspended flights from Taipei Songshan Airport to Hengchun back in September 2014.
ground_truth: the Three Gorges Dam project.
sub_queries: Liangping District >> located in the administrative territorial entity Answer: Chongqing
Why did China need to resettle people into Chongqing ? Answer: the Three Gorges Dam project.