Question: Why did China need to resettle people into the birth city of Zhao Hejing?

full_context: Document 1: 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 2: Wang Guanyi: Wang Guanyi would start his professional football career with third tier football club Tianjin Locomotive before being scouted by top tier side Shanghai Shenhua, who he eventually joined at the beginning of the 2010 league season with team mates Feng Renliang and Song Boxuan. The Head coach Miroslav Blažević would then give Wang Guanyi his debut in a league game against Tianjin Teda F.C. on August 18, 2010 in a 1-0 victory where he came on as late substitute.
Document 3: Zhao Hejing: Zhao Hejing started his football career with top tier side Chongqing Lifan and would make his league debut for the team on 3 July 2005 against Sichuan Guancheng where he conceded a penalty that led his club losing 2-1. Despite the defeat, Zhao would gradually establish himself as a regular; however, by the end of the 2006 season, he was part of the team that was relegated. He remained faithful towards the team and would be a vital player as the club won promotion back into the top tier at the end of the 2008 season. His return to the top tier often saw the club struggle within the league and Chongqing were once again relegated at the end of the 2010 season.
Document 4: S.S.D. Città di Gela: In summer 2010, Gela Calcio had not won the Lega Pro Prima Divisione, however: the failure of many teams has led the repechage in this league.
Document 5: FC Chita: Lokomotiv underwent reorganization, were renamed FC Chita and on 4 April were admitted into the Russian Second Division. FC Chita won the East (Vostok) Zone of the Second Division in 2008 and played in the Russian First Division in 2009 season. However, FC Chita relegated again to Second Division after finishing First Division as 17th.
Document 6: 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 7: 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 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: Zeng Cheng: Zeng Cheng started his football career at top tier side Wuhan Guanggu; however, he was soon loaned out to Indonesia Super League side Persebaya for more playing time at the beginning of the 2005 season. On his return to Wuhan, he would be allowed to make his league debut at the end of the league season on 5 November 2005 in a 1-1 draw against Shanghai Shenhua. For several seasons, Zeng would play understudy to Deng Xiaofei until Wuhan quit the league and were subsequently relegated in the 2008 season after the club's management did not accept the punishment given to them by the Chinese Football Association after a scuffle broke out during a league game against Beijing Guoan on 27 September 2008.
Document 10: 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 11: 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 12: Takumi Wada: He has the dubious distinction of having been relegated with 4 different clubs in 5 years from 2007-2011 (Yokohama FC, Tokyo Verdy, JEF United Chiba & Avispa Fukuoka).
Document 13: Li Kun: Li Kun started his professional football career in 2001 at top tier military club Bayi Football Team after graduating from their youth team. He initially started out as a striker and would go on to make eight league appearances within his debut season. The following season would see Li progress to become a squad regular within the team while the club experienced a disappointing season and finished thirteenth within the league. By the 2003 league season Bayi were struggling to adopt to the financial requirements required for full professionalism within Chinese football and when the team experienced relegation at the end of the season the club was disbanded.
Document 14: Wang Xiaolong: With the chance to return to his hometown and join reigning champions Beijing Guoan, Wang Xiaolong would make the switch from Shandong to Beijing at the beginning of the 2010 league season with teammate Wu Hao in a package deal.
Document 15: 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.
ground_truth: the Three Gorges Dam project.
sub_queries: What is the city of birth of Zhao Hejing? Answer: Chongqing
Why did China need to resettle people into Chongqing ? Answer: the Three Gorges Dam project.