• Tucson
  • Guandu District

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.

Guandu District, which belongs to Kunming City, Yunnan Province, is one of the four main urban areas of Kunming. it is located in the southeast of Kunming, the north bank of Dianchi Lake, Yiliang County in the east, Chenggong District in the south, Songming County in the northeast, Dianchi Lake in the southwest, Panlong District in the northwest and Xishan District in the west, with a total area of 552 square kilometers. The elevation of the whole region is between 1886.6 and 2731 meters, while that of Pingba is 1900, 2000 meters above sea level, which belongs to low latitudes and high elevations. The standard elevation is 1891 km, which belongs to the subtropical-plateau mountain monsoon climate of low latitude in north latitude. At the end of 2014, Guandu District had jurisdiction over 8 streets and 82 communities. In 2015, the resident population was 882000, the GDP of Guandu District was 90.388 billion yuan, and the per capita GDP was 10%.
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