• Tucson
  • Qianjiang

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.

Qianjiang, a county-level city directly under the jurisdiction of Hubei Province, is located in the Jianghan Plain in the central part of Hubei Province, with the Han River in the north and the Yangtze River in the south, located in the lower reaches of the Han River, across the Dongjing River and the upper and lower Xijing River. the climate belongs to the north subtropical monsoon humid climate. It has jurisdiction over 7 streets and 10 towns. The population in 2016 is 962000. Qianjiang is an important member of Wuhan urban agglomeration and urban agglomeration in the middle reaches of the Yangtze River. The county was founded in 965 AD (the third year of Song Qiande). Jianghan Oilfield, one of the top ten oilfields in China, has jurisdiction over 3 provincial-level economic development zones, 6 state-owned farms and 16 towns. It is known as "the hometown of Cao Yu, Jianghan oil city, water garden and hometown of lobster". In 2017, the gross domestic product of Qianjiang City reached 67.186 billion yuan. In June 2017, Qianjiang City was named as a national health city.
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