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  • Quxian

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.

Qu County, which belongs to Dazhou City, Sichuan Province, is located in the southwest of Dazhou City, and is connected with Guang'an, Nanchong and Bazhong landscapes. The geographical coordinates are between 106 °38 miles east longitude and 107 degrees 15 miles east, and 31 degrees 16 degrees north latitude. Quxian is located in the transitional zone between the parallel ridges and valleys in eastern Sichuan and the purple hilly region in central Sichuan, which belongs to the subtropical monsoon climate, with a total area of 2013 square kilometers. As of 2018, qu County has jurisdiction over 60 townships, with a registered population of 1.3438 million and a resident population of 1.1161 million. Qu County had human activities as early as the Neolithic Age. During the Yin and Shang dynasties, the Shang people established the national capital city in Chengba Village, Tuxi Town. In the first year of King Zhou (314 BC), Dangqu County was set up, and qu County was named in the ninth year of Hongwu in the Ming Dynasty (1376). It also built a county.
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