• Tucson
  • Huanren Manchu Autonomous County

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.

Huanren Manchu Autonomous County, which belongs to Benxi City, Liaoning Province, is located in the eastern mountain area of Liaoning Province, connected with Ji'an City, Jilin Province in the east, Kuandian Manchu Autonomous County in Dandong City in the south, Benxi Manchu Autonomous County and Xinbin Manchu Autonomous County in Fushun City in the west, and Tonghua City in Jilin Province in the north, covering an area of 3547 square kilometers. Huan Renyuan lived in the new timer era (more than 6000 years ago), and belonged to the State of Yan during the warring States period; it was connected with Ji'an City in the east, Kuandian County in Dandong City in the south, Benxi County and Xinbin County in Fushun City in the west, and Tonghua City in Jilin Province in the north, 460km from Shenyang, 174km in Dandong City, 192km in Benxi City, 70km in Tonghua City and 159km in Jian City. Huanren Manchu Autonomous County has won many honors, Fenglin
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