• Tucson
  • Xuanzhou District

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.

Xuanzhou District is under the jurisdiction of Xuancheng City, the resident of the municipal government and the only municipal district, and it is the transition zone of the Yangtze River Delta economy from the coast to the interior. Xuanzhou District is located at the junction of Jiangsu and Anhui provinces, adjacent to Shanghai and Zhejiang. It is bordered by Langxi County and Guangde County to the east, Ningguo City and Jing County to the southeast and southwest, Nanling County and Wuhu County to the west and northwest, and Gaochun District of Nanjing to the north. By the end of 2012, Xuanzhou District had jurisdiction over 26 townships, towns and streets, with a total area of 2621 square kilometers and a total population of 866000. The main landscapes in Xuanzhou District are Guangjiao Temple Twin Towers, Chenshan site, Yangzi Alligator National Nature Reserve, Jingting Mountain National Forest Park, Xie Lou site, Mei Wending Tomb, Baimashan International Holiday tourist area, Longquan Cave, Baiyun Cave and so on. Xuanzhou District was selected into the 2017 National Comprehensive.
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