• Tucson
  • Dingyuan 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.

Dingyuan County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province, between latitude 32 °12'- 32 °42'N and longitude 117 °12'- 118 °5'E. it is located in the eastern part of Anhui Province, between the hinterland of eastern Anhui and the western part of the Yangtze River Delta, which is connected with Jiangsu, Zhejiang and Shanghai, covering an area of 2998 square kilometers and cultivated land of 2.469 million mu. By the end of 2017, Dingyuan County had a population of 974900 and had jurisdiction over 22 townships and 253 administrative villages. The topography of Dingyuan County is generally high in the north and low in the south. The landforms in the territory are divided into three types: hills, wavy plains and plains. In ancient times, it has the reputation of "Jinglian Bayi, Qutong nine provinces", and it is still the key point of China's north and south. The Beijing-Shanghai high-speed railway and the Huainan railway run through the territory, and the Beijing-Taiwan highway runs across the territory. Was listed as a country in 1987
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