• Tucson
  • Ningguo City

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.

Ningguo, under the jurisdiction of county-level cities in Anhui Province, is hosted by Xuancheng. Located in the southeast of Anhui Province, the northern foot of Tianmu Mountain, the upper reaches of Shuiyang River. The total area is 2487 square kilometers, with a registered population of 384000 (2018). It has jurisdiction over 6 streets, 8 towns and 5 townships. No. 1 Shifu Lane, Renmin Road, Xijin Street, where the Municipal people's Government is stationed. Ningguo has a history of more than 1800 years since the thirteenth year of Jian'an in the Eastern Han Dynasty (208 years). In 1997, the State Council agreed to abolish Ningguo County and set up Ningguo City at the county level. Ningguo is located in the mountainous and hilly area of southern Anhui, which is high in the south and low in the north, with undulating mountains and rivers from east to west; the highest point is Longwang Mountain in the southeast, 1587 meters above sea level; the lowest point is Gangkou Town in the north, which is only 40 meters above sea level; it belongs to North Asian fever.
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