• Tucson
  • BaZhong

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.

Bazhong, a prefecture-level city of Sichuan Province, is located in the northeast of Sichuan Basin, at the southern foot of Micang Mountain in the Dabashan system, south of the north-south dividing line between Qinling and Huaihe River in China, to the east, Nanchong in the south, Guangyuan in the west, and Hanzhong in Shaanxi to the north. The terrain is high in the north and low in the south, tilting from north to south; it is a subtropical humid monsoon climate with four distinct seasons. The city has a total area of 12292 square kilometers and has jurisdiction over 2 districts and 3 counties. In 2017, the resident population is 3.3167 million. Bazhong has revolutionary relics such as the Red Army Martyrs Mausoleum and Red Army stone carving slogans, known as the "Open-air Museum of the Chinese Revolution", has a world geological park, two scenic spots are creating national AAAAA-level scenic spots, a total of 19 national AAAAA-level scenic spots. Bazhong is the second largest Soviet area in China, with red ruins.
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