• Tucson
  • Qingcheng 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.

Qingcheng District, Qingyuan Municipal District. Located in the north of central Guangdong Province, the middle and lower reaches of Beijiang River and the southernmost end of Qingyuan City, it is the political, economic and cultural center of Qingyuan City. Qingcheng District is adjacent to Qingxin District in the north, Huadu District in Guangzhou to the south, Fogang County and Conghua City to the east, Sanshui District of Foshan City to the west, and Sanshui District of Foshan City to the west. it has a total area of 927 square kilometers and has jurisdiction over 3 towns, 4 streets and 1 forest farm, with a total population of 620000 in 2008. The Beijing-Guangzhou Railway passes through Yinzhan and Yuantan stations in the region, with a 30-kilometer operation line; 107 National Highway runs through the region in the north, Qingfo Highway in the east and Qingsan Highway in the west. Beijiang River flows from east to west to 100-ton ships, with special deep-water wharf and regular flights to Hong Kong and Macao and Huangpu Port. Qingcheng District has more than 100,000 overseas Chinese and compatriots from Hong Kong and Macao.
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