• Tucson
  • HuaYing

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.

HuaYing, abbreviated for short, is directly under the jurisdiction of Sichuan Province and hosted by Guang'an City. It is one of the two sub-cities of Guang'an "Shuangbai" Group City Plan. It is located in the eastern part of Sichuan Basin, the western foot of the middle section of Huaying Mountain, and is the eastern gate of Sichuan Province. It is 126 kilometers away from Chongqing and 300 kilometers away from Chengdu, which is named after Huaying Mountain. Huaying is a heroic city and a red city. It is an excellent tourist city in China, one of the key counties and cities in Huanyu area of Sichuan Province, a garden city of Sichuan Province, and also one of the birthplaces of Hongyan spirit. Huadu, which was listed as the first batch of pilot counties and cities to expand power in Sichuan Province in 2007, was listed as the second batch of resource-based cities in Sichuan Province in 2009 and the only resource-based city in Sichuan Province to transform into pilot cities. In 2010, it was awarded the title of Old Revolutionary Base in Sichuan Province, and in 2012 it was listed.
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