• Tucson
  • Jiyuan City

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.

Jiyuan City, a county-level city directly under the jurisdiction of Henan Province, is stationed on Qinyuan Street. It gets its name from the birthplace of water relief. It is located to the north of the Yellow River, north of Taihang Mountain and Jincheng of Shanxi Province, west of Zhongtiao Mountain and Yuncheng of Shanxi Province, bordering the Yellow River and Luoyang of Henan Province in the south, and Jiaozuo in the east. Jiyuan is the birthplace of the story of Yu Gong moving away from Dashan. In ancient times, Jiyuan was the capital of Xia Shaokang. Jiyuan was famous for its wealth from the warring States period to the Han Dynasty. It was promoted to be directly administered by the province in 1997, under the direct leadership of the Henan provincial government, and was listed as one of the nine central cities of the Central Plains urban agglomeration in Henan Province in 2003. In 2005, it was upgraded to the administrative unit at the county level directly under the provincial jurisdiction of Henan Province. With the rapid development of Jiyuan economy, Jiyuan now has three listed companies, such as Jiyuan Iron and Steel, Yuguang Gold and lead. Jiyuan is rich in mineral resources, which has formed energy,
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