• Tucson
  • Langxi 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.

Langxi County, which belongs to Xuancheng City, Anhui Province, was founded in the first year of Duangong in the Northern Song Dynasty (AD 988). Located in the southeast border of Anhui Province, at the junction of Anhui, Jiangsu and Zhejiang provinces, it is known as the "thoroughfare of the three provinces" and has a superior location. As of 2018, Langxi County has jurisdiction over 7 towns, 2 townships and 1 provincial development zone, with a total population of 347500 and an area of 1104.8 square kilometers. Langxi County has a mild climate, fertile soil and rich products, known as "land of fish and rice" and "natural botanical garden". It is an important producing area of grain, oil and silkworm cocoons in Anhui Province and a national commodity grain base county; the main specialties are green tea, yellow wine, golden jujube, stuffy sauce, wild goose, silverfish, green shrimp, crab, soft-shelled turtle, etc.; the main minerals are fluorite, yellow sand, limestone, granite, kaolin, pyrophyllite and so on.
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