• Tucson
  • Pingdingshan

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.

Pingdingshan, a prefecture-level city under the jurisdiction of Henan Province, alias Eagle City, is located in Central China. Pingdingshan is an important energy and heavy industry base in the Central Plains Economic Zone, and it is also the central city of central Henan; it is high in the west and low in the east, with a trapezoidal distribution, and is located at the edge of warm temperate zone and northern subtropical climate; it now has jurisdiction over 2 cities, 4 counties and 4 districts with an area of 7882 square kilometers and a resident population of 5.2077 million in 2018. Pingdingshan is not only a resource-based industrial city, but also an excellent tourist city, a national garden city, a national forest city, a national sanitary city and a provincial civilized city. It is also the hometown of Chinese Quyi City, Chinese calligraphy City, the hometown of Chinese Guanyin Culture, the hometown of Chinese Ruyao Ceramic Art and the base of Tang Jun in China. There are 169 reservoirs in Pingdingshan, and the middle route of the South-to-North Water transfer Project passes through the city.
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