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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.

Liuzhi Special Economic Zone is under the jurisdiction of Liupanshui City, which is located in the west of Guizhou Province. It is the only administrative division named after "Special Economic Zone" in China. During the period of "third-line construction", it was formed by the merger of the original "Liuzhi Special Zone" and "Langdai County". Puding and Zhenning counties of the province are bordered to the east, Pu'an, Qinglong and Shuicheng counties to the west, Guanling County to the south, Zhijin and Nayong County to the north, with a total area of 1792 square kilometers. At the end of 2015, it had jurisdiction over 3 streets, 9 towns and 6 townships (including 5 ethnic townships), with a resident population of 494600 and 32 ethnic groups. Liuzhi Special Economic Zone is located in the east gate of Liupanshui City, the cool capital of China, and the watershed of the Yangtze River and Pearl River systems. There are more than 40 large and small rivers, which belongs to the subtropical monsoon climate. The main crop varieties are rice, corn, wheat, potato and rapeseed. Be listed successively
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