• Tucson
  • Hailing 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.

Hailing District is under the jurisdiction of Taizhou City, Jiangsu Province. The northern part of the hailing area belongs to the Lixia River plain area and the southern part belongs to the Yangtze River Delta plain area; it belongs to the northern subtropical humid monsoon climate zone with four distinct seasons, long frost-free period, abundant heat and abundant precipitation; the administrative area of Hailing District covers an area of 374.7 square kilometers and has a population of 586800 people. It has jurisdiction over 10 streets and 4 towns. Hailing District is located in the middle of Jiangsu Province and the north bank of the middle and lower reaches of the Yangtze River, facing Yangzhou to the west and Nantong to the east, facing Suzhou, Wuxi and Changzhou across the river. Hailing was once called "Siling" with Guangling Yangzhou, Lanling Changzhou and Jinling Nanjing. Hailing east and west undertake the two major economic circles of Shanghai and Nanjing respectively. The Beijing-Shanghai Expressway, National Highway 328, Ningqi Railway and five waterways connecting the Yangtze River to the sea in central Jiangsu meet here. In November 2018, he was selected as one of the top 100 industries in 2018.
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