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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.

Xuancheng, known as Wanling and Xuanzhou in ancient times, is a prefecture-level city in Anhui Province, located in the southeast of Anhui Province, bordered by Hangzhou and Huzhou in Zhejiang Province to the east, Huangshan in the south, Chizhou and Wuhu in the west and northwest, Maanshan in the province and Nanjing, Changzhou and Wuxi in Jiangsu Province to the north and northeast. It is located on the western waist line of the Shanghai-Nanjing-Hangzhou Triangle. It is a member city of Nanjing metropolitan area and the central city of G60 Kechuang Corridor. The city of Wanjiang takes the first wing of the demonstration area to undertake industrial transfer, which is the forward position for the central region to undertake the industrial and capital transfer in the eastern region, the central city of Anhui, Jiangsu and Zhejiang, and an important channel for the southeast coast to communicate with the interior. Xuancheng is located in the south of the Yangtze River, which has been said to be "the combination of the south and the north" since ancient times. Since the establishment of the county in the Western Han Dynasty, it has a history of more than 2000 years. Xuancheng has been since the Western Han Dynasty.
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