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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.

Qujing is a prefecture-level city under the jurisdiction of Yunnan Province, located in the east of Yunnan Province, at the source of the Pearl River, at the junction of Yunnan, Guizhou and Guangxi provinces and regions, known as "the key of Yunnan and Guizhou" and "Yunnan throat". It is 120km away from the provincial capital Kunming and covers an area of 28900 square kilometers, accounting for 13.63% of the area of Yunnan Province. As of April 2018, Qujing City has jurisdiction over 1 city, 3 districts and 5 counties. At the end of 2016, the total registered population of the city was 6.5297 million. Qujing is located in the Wumeng Mountains of the transitional zone from the eastern Yunnan plateau to the western Guizhou plateau in the middle of the Yunnan-Guizhou plateau. The west is embedded with the lake basin area of the central Yunnan plateau, the eastern part is gradually inclined to the Guizhou Plateau, and the central part is a watershed zone between the Yangtze River and the Pearl River. The terrain is high in the northwest and low in the southeast. There are eight unique languages of Yi, Buyi, Zhuang, Miao and Yao.
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