• Tucson
  • Pingding County

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.

Pingding County, which belongs to Yangquan City, Shanxi Province, is located in the east of the middle of Shanxi Province, the western foot of the middle part of Taihang Mountain and the southeast of Yangquan City. The geographical coordinates are 37 °39 °30 "- 38 °07" 30 "N and 113 °25" 55 "- 114 °02" 33 "E, respectively. It is bordered by Yu County and Yangquan City in the north, Shouyang County in the west, Xiyang County in the south, and Jingxing County in Hebei Province in the east. It is the main road of Shanxi-Hebei thoroughfare and the east gate of Shanxi Province. The county seat is 9 kilometers away from Yangquan city and 127 kilometers away from Taiyuan, the provincial capital. County east-west longest 54 km, north-south widest 50.4 km, covering an area of 1391 square kilometers, jurisdiction over 8 towns and 2 townships, population 345000. There are Niangziguan, Guanshan, Kaihe Temple, Guguan Great Wall and other famous scenic spots. In 2018, Pingding County completed the total regional production.
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