• Tucson
  • Yijun 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.

Yijun County, which belongs to Tongchuan City, Shaanxi Province, is located in the middle of Shaanxi Province, in the north of Tongchuan City, and at the junction of Guanzhong Plain and Northern Shaanxi Loess Plateau. The county seat is 120km south from the provincial capital Xi'an and 27km north from the Huangdi Mausoleum of Xuanyuan, with a total area of 1531 square kilometers. National Highway 210 and Tonghuang first-class highway pass through the border, known as the "flyover from Guanzhong to northern Shaanxi". Yijun County is not only named because of Yijun water, but also because it is suitable for kings to spend the summer. There are Yangshao cultural sites, Pengzu hometown, Northern Wei grottoes, Jiangnu tear Spring, Yunmeng Mountain Taoist resort, the warring States and Wei Great Wall, among which Yijun and the warring States Wei Great Wall was included in the World Cultural Heritage list of the Great Wall of China. As of 2018, Yijun County has jurisdiction over 1 street, 6 towns and 1 township. In 2017, the resident population of Yijun County was 92100.
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