• Tucson
  • Taoshan 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.

Taoshan District, which belongs to Qitaihe City, Heilongjiang Province, is located in the five major urban agglomeration centers of Qitaihe, Jixi, Jiamusi, Hegang and Shuangyashan in the east of Heilongjiang Province. On January 20, 1984, Taoshan District was established. Taoshan District covers an area of 78.9 square kilometers, 5.8 kilometers from east to west, 3 kilometers from north to south, and 160 to 320 above sea level. Taoshan District has a cold temperate continental monsoon climate, with an average annual temperature of 3.4℃, an annual maximum of 4.8℃ and an average annual precipitation of about 540mm. In 2013, the GDP of Taoshan District was budgeted to reach 3.09 billion yuan, down 21.8% from the same period in 2012. After adjusting the budget, the full-caliber revenue will reach 270 million yuan, and the public budget revenue will reach 160 million yuan. Investment in social fixed assets reached 1.1 billion yuan, compared with the same period last year.
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