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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.

Changshun County belongs to Qiannan Buyi and Miao Autonomous Prefecture of Guizhou Province of the people's Republic of China. The county government is stationed in Changzhai Town, which is located in the south-central part of Guizhou Province and the west of Qiannan Prefecture. Changshun County has a total area of 1543 square kilometers. The county seat is 84 kilometers away from the provincial capital Guiyang, 178 kilometers from Duyun, the state capital, and 85 kilometers from Anshun City. Jurisdiction over 5 towns, 1 township, 1 street. The total population is 256600 (2015), with ethnic minorities accounting for 56% of the population, mainly Buyi and Miao. The mountains of Changshun County belong to the Miaoling mountain system, the north of the Miaoling watershed Henggen County, the topography is high in the north and low in the south, the geomorphology type is the hilly area in the north, the hilly area in the west, the middle and low karst mountains in the south, and the peak and cluster valley in the east. The rivers belong to the Yangtze River and the Pearl River. Industry has coal mining, chemical fertilizer, building materials, feed processing. Agriculture
Travel Guides In Changshun Country
Travel Notes In Changshun Country
People in Changshun rely on good mountains and rivers to "sell scenery" and eat "tourism meals"!
Beside the highway in the Shenquan Valley Scenic Area in Changshun County, the brand-new immigrant communities are particularly eye-catching. This is