• Tucson
  • Nanzheng 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.

Nanzheng District, which belongs to Hanzhong City, Shaanxi Province, gets its name because of Zheng people's running south. It is located in the southwest border of Shaanxi Province, southwest of Hanzhong Basin, facing Hanjiang River in the north and Yiba Mountain in the south. The area is adjacent to Chenggu County and Xixiang County in Shaanxi Province in the east, Tongjiang County, Nanjiang County and Wangcang County in Sichuan Province in the south, Ningqiang County and Mian County in Shaanxi Province in the west, and Hantai District in Shaanxi Province across the river in the north, covering an area of 2809.0363 square kilometers. The climate in the territory belongs to the north subtropical zone and the warm temperate zone, especially in the north subtropics. Nanzheng is not only an important part of Hanzhong "double hundred" urban planning, but also an economically developed area of Hanzhong City, which has a world-class Tiankeng group. Nanzheng District is also a large area of tourism resources in Shaanxi Province, with scenic spots such as Nanhu Lake, Hongsi Lake,
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