• Tucson
  • Anding 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.

Anding District, which means "peaceful and stable", belongs to Dingxi City, Gansu Province. It is the seat of Dingxi Municipal Party Committee and Municipal Government. It is located in the central part of Gansu Province. It is 82.9km long from north to south and 73.3km wide from east to west, with a total area of 4225 square kilometers. The region has jurisdiction over 12 towns, 7 townships and 3 subdistrict offices, with a resident population of 430500 at the end of 2017. Anding District was built in 1096 AD (the second year of Shaosheng in the Northern Song Dynasty), named "Dingxizhai", and Dingxi County was founded in 1142 (the second year of Jin Huangtong). In September 2003, Dingxi County withdrew its county and set up a district, which was renamed as "Anding District of Dingxi City". Anding District is one of the birthplaces of the Yellow River civilization, the important town of the ancient "Silk Road" and the necessary place for the New Eurasian Continental Bridge. It is known as "Gansu throat and Lanzhou Gateway", which is far away from the provincial capital Lanzhou.
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