• Tucson
  • Qilin 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.

Qilin District, which belongs to Qujing City, Yunnan Province, is the seat of Qujing Municipal Government. It is located in the eastern part of Yunnan Province, in the middle of the eastern Yunnan Plateau, in the upper reaches of Nanpanjiang River, between 103 °29 degrees east longitude and 104 °14 degrees east longitude and 26 °06 degrees north latitude. It is 137km away from the provincial capital Kunming and covers an area of 1552.84 square kilometers. In 2017, Qilin District has a registered population of 749900, with a GDP of 63.3 billion yuan, and has jurisdiction over 13 streets and 3 towns. The terrain is high from east to west and low from north to south, with mountains, river valleys and hills interlaced with each other. The urban area is 1875 meters above sea level. Guiyang-Kunming Railway, National Highway 320 and National Highway 326 are distributed radially in the territory. Qilin District has been appraised as the national sustainable development experimental area, the national ecological demonstration area and the national science popularization demonstration area.
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