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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.

Qianxi County, which belongs to Tangshan City, Hebei Province, is located at the southern foot of Yanshan and at the foot of the Great Wall, the hinterland of Beijing, Tianjin and Tang Dynasty, with an area of 1439 square kilometers, with a natural pattern of "seven mountains, one water and half field, half-divided roads and manors". It has jurisdiction over 17 townships, 417 administrative villages, 1 subdistrict office, 11 neighborhood committees, with a total population of 410000, and 21 Jingzhong East Street, where the government is stationed. Qianxi County was built in 1946, which got its name from the analysis of Qianxi County in the west of Qianan. Five or six thousand years ago, human beings have lived here. Qianxi is the birthplace of Yanzhao culture and Luanhe culture, with the Neolithic cultural Xizhai site more than 7000 years ago, the most complete brick kiln of the Ming Great Wall and the best preserved Yumuling Great Wall. Song Zhe Yuan, Zhang Zizhong and other famous generals fought to the death against the Japanese aggressors at Xifengkou.
Airport In Qianxi County - Tangshan Sannvhe Airport
Tangshan Sannvhe Airport (Tangshan Sannvhe Airport, IATA: TVS, ICAO: ZBSN), located on Airport Road, Shigezhuang Town, Fengrun District, Tangshan City, Hebei Province, China, 19.5 kilometers southeast of Tangshan city center, is a 4C-level military-civilian joint regional airport   .
On February 26, 2009, the Tangshan Airport of the Air Force officially started the military-civilian reconstruction and expansion project   ; On June 1, 2009, Tangshan military-civilian combined airport was named "Tangshan Sannvhe Airport"   ;On July 13, 2010, Tangshan Sannvhe Airport officially opened civil aviation business   .
As of February 2021, the terminal area of ​​Tangshan Sannvhe Airport is 6,187 square meters, with 3 boarding bridges; the civil aviation station area is 32,000 square meters, with 8 seats, including 2 class B seats, 6 C-class seats; the runway is 2,700 meters long and 50 meters wide; it can meet the needs of an annual passenger throughput of 1 million passengers and a cargo and mail throughput of 3,200 tons       .
In 2021, Tangshan Sannvhe Airport will handle a total of 394,365 passengers, a year-on-year decrease of 9.7%, ranking 146th in the country; cargo and mail throughput will be 291.7 tons, a year-on-year decrease of 73.1%, ranking 157th in the country; aircraft takeoffs and landings will be 4,610 Flights, down 13.5% year-on-year, ranking 168th in the country   .
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