• Tucson
  • Xiao 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.

Xiao County, a county under the jurisdiction of Suzhou City, Anhui Province, is located at the north gate of Anhui Province, at the junction of Jiangsu, Shandong, Henan and Anhui provinces, at the center of Huaihai Economic Zone, Xuzhou metropolitan area and the southeast edge of North China Plain. Known as the "thoroughfare of the four provinces", it is the node of the national implementation of overall strategies such as "Belt and Road Initiative" and "Central Plains Economic Zone" and the implementation of regional strategies such as "eastward development" and "revitalization of northern Anhui" in Anhui Province. It is bordered by Xuzhou in the east, Huaibei in the south, Lianfeng County in the north, Yongcheng and Dangshan in the northwest, Heze in Shandong Province, and Hanqiao District in Suzhou in the southeast, covering an area of 1885.3 square kilometers. Xiao County, known as Xiao Guo in ancient times, has a history of more than 6000 years of civilization and more than 3100 years of history of building the city. It is the birthplace of Han culture and filial piety culture. There are Jinzhai cultural sites, Huajia Temple sites and other Neolithic sites.
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