• Tucson
  • Qinshui 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.

Qinshui County, which belongs to Jincheng City, Shanxi Province, is located in the southeast of Shanxi Province, northeast of Zhongtiao Mountain and the middle reaches of Qinhe River. The junction of Taihang, Taiyue and Zhongtiao mountain systems. The county is surrounded by mountains, east to Laomaling, and Yueshen Mountain to Gaoping City and Zezhou County; to the west to Dongwuling and Yicheng County; to the south to Xianweng Mountain and Shunwangping to Yangcheng and Yuanqu County; to the north to Xiangshanling, Guandiling and Yujun Mountain adjacent to Fushan, Anze and Changzi County. It is between 35 °24 degrees north latitude and 36 °04 degrees north longitude and 115 °55 degrees east longitude, with a total area of 2676.6 square kilometers. Qinshui has a long history. Since ancient times, there have been legends of Nu Kui mending the sky and Shun ploughing through the mountains. The Xiachuan site excavated in the 1970s proves that as early as 23000 to 16000 years ago, the people of Qinshui
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