• Tucson
  • Longhai City

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.

Longhai City (ancient Longxi County and Haicheng County) is located at the mouth of the Jiulong River in the south of Fujian Province. In February 1960, Longxi and Haicheng County organs moved to Shima Town Joint Office from downtown Zhangzhou and Haicheng respectively; in August, Longxi and Haicheng counties were merged into Longhai County. In June 1961, three production brigades of Tianbao and Punan communes in Longhai County, three production brigades of Jiuhu Commune, one production brigade of Buwen Commune and the back room farm were assigned to Zhangzhou City (now Xiangcheng District). It was identified as the first batch of coastal open counties by the state in 1985, and was removed from the county to set up cities in 1993. In 1996, the two towns of Guokeng and Buwen (except Wupu and Changzhou villages) were set up under the jurisdiction of Longwen District. In 2012, Jiaomei Town was designated to establish Zhangzhou Taiwan Investment Zone, which is separately managed by Zhangzhou City. The total area of the city is 1128 square meters.
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