• Tucson
  • Bozhou

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.

Bo (b ó) Zhou, referred to as Bo, was called "qiao City" in ancient times, and it was a prefecture-level city in Anhui Province. Located in the northwest of Anhui Province, located at the southern end of the North China Plain, 330km away from the provincial capital Hefei, located in longitude 115o 53km east, latitude 32 °51m "35 °05km, bordering Henan Province in the west and north, Fuyang City in the southwest, Huaibei City and Bengbu City in the east, and Huainan City in the southeast, covering an area of 8374 square kilometers. Bozhou is a famous national historical and cultural city. Human beings have been active here since the Neolithic Age, and it is one of the birthplaces of the ancient culture of the Chinese nation. In the Yan-Huang era, Emperor Kui (the great-grandson of the Yellow Emperor) took the place of the Emperor, all in Bo. Shang Cheng Tang destroyed Xia and established the Shang Dynasty in Bolidu 190 years. Since the Qin Dynasty set up Yixian County, there have been more and more dynasties.
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