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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.

Huaibei, referred to as "Huai", called "Xiangcheng" in ancient times, is a prefecture-level city in Anhui Province. The central city in the northeast of Anhui Province, an important energy city in the country. Located in the north of Anhui Province, it is located at the junction of Jiangsu, Shandong, Henan and Anhui provinces, Xiao County in the north, Bozhou in the south, Suzhou in the east and Shangqiu in Henan Province in the west. It is 150km long from north to south and 50km from east to west, with a total area of 2802 square kilometers, making it the smallest prefecture-level city in Anhui Province. The total population in 2016 is 2.165 million. It has jurisdiction over three municipal districts in Xiangshan District, Liishan District, Duji District and one county in Suixi County. The municipal government is stationed in Xiangshan District. Huaibei has a long history and a gathering of humanities. More than four thousand years ago, the eleven ancestors of Shang and Tang Dynasty built the city at the southern foot of Xiangshan, which was the beginning of civilization. Since then, successive dynasties have set up counties and counties here. There are Uncle Yu, Huan Tan, Ji Kang, Liu Ling and so on.
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