• Tucson
  • Zhiduo County

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.

Zhiduo County is a county under the jurisdiction of Yushu Tibetan Autonomous Prefecture in Qinghai Province, which is located in the southwest of the province, the central and western part of the state border, and bordered by Xinjiang and Tibet Autonomous region in the west. The county government is stationed in Jiaji Borough (in Duocai Township). The county is bordered by Yushu County in the east, Hercynian escrow District in the west, Qumalai County and Haixi County in the north, and Zaduo County in the south. 921 kilometers away from the provincial capital Xining, 195 miles from the state capital, 109 National Highway and Qinghai-Tibet Railway pass through the waist. By the end of 2007, the total population of the county had reached 28200, mainly Tibetans, accounting for 97.8% of the total population, as well as Han, Hui, Qala and other ethnic groups. The total land area is 80200 square kilometers and it has jurisdiction over 6 townships. In 2007, the county's GDP reached 208.587 million yuan. On December 29th, 2018, Zhiduo County was killed.
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