• Tucson
  • Shanzhou 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.

Shaanxi District, which belongs to Sanmenxia City, Henan Province, is located in the west of Sanmenxia City, bordering Mianchi County in the east, Lingbao City in the west, Ganshan and Luoning County in the south, and the Yellow River and Pinglu County in the north. Sanmenxia city and lakeside area are surrounded on the east and southwest. In 2017, it covers an area of 1609.73 square kilometers and has jurisdiction over 4 towns and 9 townships with a total population of 350100, with an annual GDP of 21.8 billion yuan. Shaanxi has a warm temperate continental monsoon climate, with high topography in the south and low in the north, east and west. Gold, bauxite, coal and geothermal mineral water are listed as the four dominant resources. Longhai Railway, Zhengxi High Speed Railway, Lianhuo Expressway, 209 National Highway and 310 National Highway crisscross in the territory. Famous landscapes include pit courtyard, stone trench ancient road, Kongxiang Temple and so on. The second batch of building a water-saving society
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