Question: Why did China need to resettle people into the city where Dazu district is located?

full_context: Document 1: 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 2: Guang'an: Guang'an () is a prefecture-level city in eastern Sichuan province. It is most famous as the birthplace of China's former paramount leader Deng Xiaoping. Guang'an lies between the hills of central Sichuan and the gorges area of the east.Guang'an is the only "Sichuan Chongqing Cooperation Demonstration Zone" in Sichuan and the nearest prefecture level city from the main city of Chongqing. It has been incorporated into the 1 hour economic circle of Chongqing. Because of its strategic location, it is called the "Gateway to Eastern Sichuan". Its population as of 2010 census was 3,205,476. whom 858,159 lived in the built-up ("or metro") area made of 2 urban districts.
Document 3: Sichuan: Chengdu Economic and Technological Development Zone (Chinese: 成都经济技术开发区; pinyin: Chéngdū jīngjì jìshù kāifā qū) was approved as state-level development zone in February 2000. The zone now has a developed area of 10.25 km2 (3.96 sq mi) and has a planned area of 26 km2 (10 sq mi). Chengdu Economic and Technological Development Zone (CETDZ) lies 13.6 km (8.5 mi) east of Chengdu, the capital city of Sichuan Province and the hub of transportation and communication in southwest China. The zone has attracted investors and developers from more than 20 countries to carry out their projects there. Industries encouraged in the zone include mechanical, electronic, new building materials, medicine and food processing.
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: Chuanhui District: Chuanhui District () is a district of the city of Zhoukou, Henan province, China. It lies at the intersection of the Ying River, Sha River and Jialu River. The name "Chuanhui" means that three rivers come across. From 17th century to 19th century, it was an important port in China's Inland Waterway System, connecting Huai River and Yellow River. Now it is the place where the government of Zhoukou City locates.
Document 6: Dazu District: Dazu District () is a district of Chongqing, China, bordering Sichuan province to the northwest. It is where the famous Dazu Rock Carvings, a UNESCO World Heritage Site, is located.
Document 7: 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 8: Zhejiang: Valleys and plains are found along the coastline and rivers. The north of the province lies just south of the Yangtze Delta, and consists of plains around the cities of Hangzhou, Jiaxing, and Huzhou, where the Grand Canal of China enters from the northern border to end at Hangzhou. Another relatively flat area is found along the Qu River around the cities of Quzhou and Jinhua. Major rivers include the Qiangtang and Ou Rivers. Most rivers carve out valleys in the highlands, with plenty of rapids and other features associated with such topography. Well-known lakes include the West Lake of Hangzhou and the South Lake of Jiaxing.
Document 9: 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 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 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 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: Nanwu Si Monastery: Nanwu Si Monastery is a Tibetan Buddhist monastery west of the town of Kangding in Kangding County of the Garzê Tibetan Autonomous Prefecture, in Sichuan Province, southwestern China.
Document 14: Dakeng: Dakeng (traditional Chinese: 大坑, Hanyu Pinyin: dàkēng) is the area that contains most of the mountain region of Beitun District, Taichung, Taiwan.
Document 15: 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.
ground_truth: the Three Gorges Dam project.
sub_queries: Dazu District >> located in the administrative territorial entity Answer: Chongqing
Why did China need to resettle people into Chongqing ? Answer: the Three Gorges Dam project.