• Tucson
  • Guangyuan

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.

Guangyuan City, a prefecture-level city under the jurisdiction of Sichuan Province, borders Gansu Province and Shaanxi Province in the north; Nanchong City in the south; Mianyang City in the west; Bazhong City in the east; on the northern edge of Sichuan, the mountain is in the transition zone to the basin, belonging to the subtropical humid monsoon climate; the city has a total area of 16314 square kilometers, with 3 districts and 4 counties under its jurisdiction; and there are 3.0262 million registered residents in 2017. Guangyuan City has been an important passageway into Sichuan since ancient times. It is the old place of Guo, the fortress of entering Shu, and the important town of the three Kingdoms. Guangyuan has a profound cultural heritage, especially the bright red gene handed down from generation to generation. Guangyuan is the concentrated display of pre-Qin ancient plank road culture and Chinese Shu road culture, the core corridor of the history and culture of the three Kingdoms, and the birthplace of the only female emperor Wu Zetian in Chinese history. It is also the core area of the former Sichuan-Shaanxi Soviet area and the later stage of the Red fourth Front Army.
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