• Tucson
  • Guzhen 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.

Guzhen County, which belongs to Bengbu City, Anhui Province, is located in the northeast of Anhui Province, on the north bank of the middle reaches of the Huaihe River, adjacent to the outskirts of Bengbu to the south, Tuohe River to the north and Lingbi County to the north, Wuhe County to the east, Huaiyuan County to the southwest, and Changqiao District of Suzhou to the northwest; the topography is a sloping plain, located in the transition zone between subtropical and warm temperate zones; the total land area is 1363 square kilometers. Guzhen County has a long history. Liu Bang, the ancestor of the Han Dynasty, set up Guyang County here, and the relics still exist; during the Taihe period of the Northern Wei Dynasty, Guyang Town was changed to Guyang Town, which later evolved into a solid town; in the first 202 years, the famous "Battle of Guxia" took place in Guzhen, which opened the foundation of the Han Dynasty for 400 years, leaving touching stories such as "besieged on all sides" and "Farewell my Concubine". "Guxia site" was listed as a national key cultural relic protection unit; archaeologists discovered 4.
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