• Tucson
  • Xi'an 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.

Xi'an District is located in the southwest of Mudanjiang City, Heilongjiang Province, with a total area of 445 square kilometers. It has jurisdiction over five subdistrict offices: Wenchun Town, Hainan Korean Township and Pioneer, Torch, Peony, Jiangbin and cement. With a total population of 249000 (2011), the Korean ethnic group accounts for the majority of the 16 ethnic minorities, about 16500. Mudanjiang passes through the city, and the green coverage rate in the urban area is 42%. In 2011, the added value of the district completed 2.22 billion yuan. As of 2013, it has thousands of wild economic plants, more than 50 kinds of rare animals and more than 40 kinds of rich mineral resources. Rich in ginseng, Acanthopanax senticosus, astragalus, hericium Erinaceus, black fungus, bracken and other valuable mountain products. In addition, Xi'an District also has Baoshan Lake Villa, Jingpo Lake and other tourist attractions. December 2018, confirmed by the Ministry of Civil Affairs
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