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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.

Quanjiao County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province, on the south side of the Jianghuai Watershed, between Hefei, the capital of Anhui Province and Nanjing, the capital of Jiangsu Province. Quanjiao County is located in the Jianghuai hilly area, with low mountains and hills in the northwest. The east and south are corrugated plains alternating with hills and hills, with sporadic distribution of residual hills and a subtropical monsoon climate with a total area of 1568 square kilometers. Quanjiao County was first built in the Western Han Dynasty, the name of the county evolved from the ancient country. Legend has it that the ancient Gao Yang established Gujiao Kingdom in Jiaolingshan (also known as Busan, in today's city). In the Spring and Autumn period, it was Chu Jiaoyi, and then Quanshi lived. Han Dynasty set up governance in Gujiaoyi County, hence the name Quanjiao County. Quanjiao is the cultural hometown of Chongwen and heavy education, which has given birth to many local scholars, the most famous of which is Wu Jingzi, the author of the Outer History of Scholars, which created a precedent of Chinese satirical novels. Quanjiao County
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