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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.

Wushan County, which belongs to Tianshui City, Gansu Province, is located in the southeast of Gansu Province. It is located in the compound zone between the western section of the northern slope of the Qinling Mountains and the southwest edge of the Longzhong Loess Plateau. It is between 1365 and 3120 meters above sea level, and belongs to temperate continental semi-humid monsoon climate. The total area is 2011 square kilometers and the total population is 460000 (2012). In 2012, Wushan County achieved a GDP of 3.88811 billion yuan. Wushan has water curtain cave, wooden ladder Temple, Laojunshan Forest Park, Caochuan prairie and other scenic spots. Wushan is a national standardized vegetable production demonstration county, a national green vegetable demonstration county, a national key vegetable production county, "the hometown of Chinese leek", "the hometown of Chinese folk culture and art", "the hometown of national martial arts" and "the hometown of jade articles". On April 28, 2019, the Gansu provincial government approved Wushan
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