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  • Chunhua County town

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.

Chunhua County, which belongs to Xianyang City, Shaanxi Province, is located in the west of the central part of Shaanxi Province and the north of Xianyang City. It is located at 108 °18 degrees east longitude 108 °50 miles east longitude, 34 °43 degrees north latitude 35 °03'. It is connected to Xunyi in the north, Jingyang and Liquan in the south, Sanyuan and Yaoxian in the east, and Yongshou and Binxian in the west. Chunhua County is located in the hinterland of Sanqin, the sun of Jingshui, 75 kilometers away from Xi'an, Xianxian Expressway and 211 National Highway. In ancient times, Huangdi, the first ancestor of China, built a Ming court in Ganquan Mountain, built a tripod in Jingshan, offered sacrifices to the gods and ruled the world. The Zhou, Qin, Han and Tang dynasties are the capital of the capital, and they are famous all over Kyushu for their "three auxiliary famous cities". Chunhua has become an ancient land, with 324 historical relics and monuments, the rare "Dading of the Western Zhou Dynasty" in the country, the only grottoes carved in the third order of the Tang Dynasty in the world, and China.
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