• Tucson
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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.

Guizhou, referred to as "Guizhou" or "Gui" for short, is a provincial administrative region of the people's Republic of China. Guiyang, the provincial capital, is located in the hinterland of southwest China. It is a transportation hub in southwest China and an important part of the Yangtze River economic belt. China's first national big data comprehensive experimental area, world-famous mountain tourism destinations and major mountain tourism provinces, national ecological civilization experimental area, inland open economic experimental area. It is bounded by 24 °37 degrees north latitude 29 °13 'longitude, 103 °36 degrees east longitude, 109 °35 degrees east longitude, Sichuan and Chongqing to the north, Hunan to the east, Guangxi to the south, and Yunnan to the west. The topography of Guizhou is high in the west and low in the east, tilting from the middle to the north, east and south. The geomorphology of the province can be summarized as follows: the topography is high in the west and low in the east, tilted from the middle to the north, east and south, and the landform is plateau and mountainous area.
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