• Tucson
  • Dawu

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.

Dawu County, which belongs to Xiaogan City, Hubei Province, is located on the border between Hubei and Henan in the northeast of Hubei Province, the southwest section of the Dabie Mountains, 48.8km from north to south and 42.2km from east to west, with a total area of 1985.71 square kilometers. Dawu County, formerly known as Lishan County, was founded in 1933 and renamed Dawu County in 1952. It is the hinterland of the old revolutionary base area of Hubei, Henan and Anhui. Zhou Enlai, Dong Biwu, Li Xiannian, Xu Qian and other party and state leaders left battle footprints in Dawu, and it was also the hometown of Li Yuanhong, the great president of the Republic of China. In 2018, Dawu County has jurisdiction over 14 towns and 3 townships. In 2017, Dawu County had a total population of 632012, with a gross domestic product (GDP) of 14.07977 billion yuan, of which the primary industry was finished.
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