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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.

Tongan District (ancient Tongan County, Quanzhou Prefecture) is one of the six districts of Xiamen, also known as "Silver City". It was bought in the third year of Taikang in the Western Jin Dynasty (AD 282) and soon abandoned. Tang Zhenyuan nineteen years (803) analysis of Nanan County Datong Field, Tang Changxing four years after the five dynasties (933). Tianfu four years after the Jin Dynasty (939), the same field as Tongan County, is the capital of Quanzhou. In 1958, Tongan County was divided into Xiamen City, Tongan County was divided into Jinjiang area in June 1970, and Xiamen City in June 1973. The implementation of county governance, because the county seat is in the shape of a waist silver ingot, it is called "Silver City". In history, it had jurisdiction over Jinmen, Xiamen, Jimei District and a small part of the eastern part of Zhangzhou Taiwan Investment Zone. After liberation, the administrative area was changed several times and was assigned to it in 1973.
Airport In Tong'an District - Xiamen Gaoqi International Airport
Xiamen Gaoqi International Airport (Xiamen Gaoqi International Airport, IATA: XMN, ICAO: ZSAM), located in Huli District, Xiamen City, Fujian Province, China, is a 4E-class civil international airport and an important regional aviation hub on the southeast coast of China. One of the two major trunk airports.  
Xiamen Gaoqi International Airport was opened to traffic in 1983. In November 1996, Terminal 3 of the airport was put into use. In December 2014, Terminal 4 was officially opened, and the annual passenger handling capacity of the airport rose to 27 million.   
According to information on the airport's official website in September 2017, Xiamen Gaoqi International Airport has a 3,400-meter-long runway, 2 parallel taxiways and 10 contact roads; the total area of ​​the apron is 770,000 square meters, with 89 parking spaces; the terminal building The total construction area is 237,800 square meters; a total of 109 cities and 182 domestic and overseas routes have been opened.  
In 2016, Xiamen Gaoqi International Airport completed a passenger throughput of 22.7376 million passengers, a year-on-year increase of 4.2%; cargo and mail throughput of 328,400 tons, a year-on-year increase of 5.7%; take-off and landing sorties of 183,500 vehicles, a year-on-year increase of 1.9%, ranking first in China respectively. 11, 12, 13.  
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