• Tucson
  • Pingchuan 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.

Pingchuan District is a municipal district under the jurisdiction of Baiyin City, Gansu Province, which is located in the north of the middle of Baiyin City, Gansu Province. The general characteristics of the topography of Pingchuan District are high in the southeast and low in the northwest, tilting from the southeast to the northwest. The total area is 2106 square kilometers and the population is 209000 (2016). Pingchuan District has jurisdiction over 4 streets, 4 towns and 3 townships. Pingchuan is an important coal and electricity energy base in Gansu, with an annual output of more than 12 million tons of high-quality raw coal and 13 billion kilowatt-hours of electricity generation. Pingchuan is the largest ceramic production base in northwest China, with clay reserves of more than 4 billion tons and annual output of nearly 20 million square meters of wall and floor tiles. Pingchuan has been awarded "China Ceramic Industry transfer demonstration Base" by China Ceramic Industry Association. In 2009, Pingchuan District won the title of Advanced Zone of Scientific and technological Progress in China. In 2016, Pingchuan District achieved regional health throughout the year.
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