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Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Yibin, a prefecture-level city in Sichuan Province, is known as "the first city of the Yangtze River, the wine capital of China, and the bamboo capital of China". Located in the junction of the three provinces of Yunnan, Guizhou and Sichuan, at the confluence of Jinsha River, Minjiang River and Yangtze River; the terrain is high in the southwest and low in the northeast, which belongs to the humid climate of the mid-subtropical monsoon, and the forest coverage of the city is more than 46%. The content of negative oxygen ions in the air is as high as 47000 / cubic centimeter (Qidonggou), which is extremely suitable for human habitation. Changning County in the area has become a famous Changshou County. It covers an area of 13283 square kilometers and has jurisdiction over 3 districts and 7 counties. At the end of 2018, the registered population is 5.523 million. Yibin has a profound cultural heritage, with a history of 2200 years of city building, 4000 years of wine-making history and 3000 years of tea-growing history. It is a famous national historical and cultural city. There have been a large number of celebrities in past dynasties, who have raised Li Shuoxun.
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