• Tucson
  • Linqing

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.

Linqing City, under the jurisdiction of county-level cities in Shandong Province, is hosted by Liaocheng City; located in the northwest of Shandong Province, at the confluence of Zhangwei River and the ancient canal, opposite Hebei Province, the terrain is flat, with few ups and downs, the terrain is high in the southwest and low in the northeast, which is a typical continental monsoon climate; the total area is 960 square kilometers, with 12 towns and 4 streets; the total population in 2016 is 821200. The county system was established in Linqing at the beginning of the Western Han Dynasty. During the Ming and Qing dynasties, thanks to the developed water transport of the Beijing-Hangzhou Grand Canal and economic and social prosperity for more than 500 years, it was an important circulation hub city and a well-known commercial city in the country at that time. Beijing-Kowloon high-speed railway will set up stations in Linqing, 2 highways (Xinglin Expressway and German-Shang Expressway) and 7 national and provincial highways (Provincial Highway 315, Linguan Road, Linxin Road, Liaolin Road and Linlin Road).
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