• Tucson
  • Dawa District

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.

Dawa District belongs to Panjin City, Liaoning Province, which is located in the southwest of Liaoning Province. The lower reaches of the Daliao River and Shuangtaizi River (Liao River) enter the sea and the northeast bank of Liaodong Bay. The central location is 122 °07 north latitude and 40 °98 'east longitude, facing Haicheng and Dashiqiao in the southeast. As of 2014, Dawa District (then known as Dawa County, the same below) covers an area of 1387 square kilometers, has jurisdiction over 15 towns, with a registered population of 350000 and a resident population of 430000. In Dawa District, there are General Zhang Xueliang's hometown, Ganggang Scenic spot, Liaohe Delta Wetland and other scenic spots, as well as historical celebrities such as Zhang Xueliang, Hu Jinbo, Li Rongjing and so on. At the end of 2018, the GDP of Dawa region reached 13.75 billion yuan, the general public budget revenue reached 1.22 billion yuan, and the added value of industries above scale reached 17.6%.
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