• Tucson
  • Xiayi

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.

Xiayi County, referred to as Li, known as Liyi in ancient times, is under the jurisdiction of Shangqiu City, Henan Province, known as "the land of Confucius in China". Located in the east of Henan Province, the joint of Henan, Shandong, Jiangsu and Anhui provinces, Yongcheng and Dangshan counties to the east, Yucheng County to the west, Qiaocheng District, Bozhou City, Anhui Province to the south, Shan County, Heze City, Shandong Province to the north, Longhai Railway and Lianghuo Expressway across Xiayi, it is the best investment city for the Central Plains to undertake the industrial transfer of the three major economic circles of "Yangtze River Delta", "Pearl River Delta" and "around Bohai Bay". As of September 2018, Xiayi County has jurisdiction over 24 townships and 731 administrative villages, with a total area of 1481 square kilometers and a total population of 1.2 million. Xiayi is the ancient capital of China, the ancestral land of China, and one of the birthplaces of Longshan culture. There were people here as early as the Neolithic Age more than 5000 years ago
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