• Tucson
  • Jingde

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.

Jingde County, belonging to Xuancheng City, Anhui Province, belongs to Youzhou in ancient times. It is located in the hinterland of southern Anhui, relying on Huangshan in the west, Jiangsu, Zhejiang and Shanghai in the east, and Wanjiang in the north. It was built in the second year of Tang Baoying (763), and the name of the county came from "showing Fangde". By the end of 2017, Jingde County had jurisdiction over 10 towns, with a resident population of 125000, with a total area of 904.8 square kilometers. Jingde County has excellent ecology. In 2018, the county has a forest area of 750000 mu, with a forest coverage rate of 66%. It is a state-level ecological county, a national key ecological functional area, the core area of the international cultural tourism demonstration zone in southern Anhui, and one of the important channels for the Yangtze River Delta to enter the Huangshan Scenic area. Jingde traffic is convenient, the territory of 205 National Highway, 217 Provincial Highway, 323 Provincial Highway and other important roads crisscross. Hongmen Interchange Project of Yangji Expressway has been completed and opened to traffic. Wuhuang
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