• Tucson
  • Yangxi County

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.

Yangxi County, founded in 1988, belongs to Yangjiang City, Guangdong Province, located on the southwest coast of Guangdong Province, facing Jiangcheng District to the east, Yangchun City to the north, Dianbai District to the west and Nanhai to the south. The total area of the county is 1455 square kilometers and the coastline is 126.6 kilometers long. 325 National Highway and Guang-Zhan Expressway run through the whole territory and form a sea and land transportation network with coastal highway, Yangyang railway and national first-class port Yangjiang port. Yangxi is located in the transitional zone between the south subtropics and the middle subtropics by the mountains and the sea. Yangxi County is the "China knife Center", "China plastic blowing Film Grade Color Masterbatch production Base", "National Jinjiang Oyster hanging and raising Standardization demonstration Zone", and "the hometown of Guangdong Folk songs." In 2014, the GDP of Yangxi County was 16.417 billion yuan. Yangxi County is a pilot project of a country with strong intellectual property rights.
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