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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.

Wuling, located in northern Hunan and north-central Changde, located in the west of Dongting Lake, is an ancient historical and cultural city in northwest Hunan, the seat of Changde municipal government, and the political, economic and cultural center of Changde and even northwest Hunan. Since the Qin-Shu county guard Zhang Ruo built the city here, it has a history of more than 2280 years, which is called Zhang Ruocheng. Wuling is not only the transportation hub between the north and the south in ancient times, but also the transportation road from eastern Guizhou to Jiangsu and Anhui, the gateway for the feudal rulers to develop the southwest, and the famous "land of fish and rice" in the south of the Yangtze River. There are mainly Willow Leaf Lake, Changde Poetry Wall, Lakeside Park, penholder City, Changde Museum, Hefei National Forest Park and other scenic spots. 2017 China's top 100 industrial areas. In September 2018, the White Paper on the Development of China's Top 100 regions in 2018 was released in Beijing.
Airport In wuling - Changde Taohuayuan Airport
Changde Taohuayuan Airport (Changde Taohuayuan Airport, IATA: CGD, ICAO: ZGCD), located in Taohuayuan Road, Doumu Lake Street, Dingcheng District, Changde City, Hunan Province, China, 13 kilometers northeast of Changde city center, is a 4D-level domestic feeder airport, and Changsha Huanghua International Airport and Zhangjiajie Hehua International Airport are mutually alternate airports   .
On December 10, 1959, construction of Changde Doumu Lake Airport started [twenty three]  ; In December 1960, Changde Doumu Lake Airport opened to traffic   ; On April 15, 1965, Changde Doumu Lake Airport opened for civil aviation [twenty three]  ; On October 28, 1991, the flight area index of Changde Doumu Lake Airport was changed to 3B [twenty four]  ; On August 30, 1996, Changde Doumhu Airport flight area indicator was changed to 4C   ; On August 4, 1999, Changde Doumu Lake Airport was renamed Changde Taohuayuan Airport; in 2015, the flight area indicator of Changde Taohuayuan Airport was changed to 4D   .
As of February 2021, the terminal building of Changde Taohuayuan Airport covers an area of ​​20,165 square meters, including 5,600 square meters for the international terminal area, with a total of 4 boarding bridges; the area of ​​the civil aviation station is about 53,000 square meters, with 4 Class D Aircraft seats and 9 C-class seats; one asphalt runway with a length of 2,600 meters and a width of 45 meters; it can meet the annual passenger throughput of 2.2 million passengers, cargo and mail throughput of 16,000 tons, and transportation take-off and landing of 21,000 sorties. need       .
In 2021, Changde Taohuayuan Airport will handle a total of 1,008,348 passengers, a year-on-year increase of 4.4%, ranking 94th in the country; cargo and mail throughput will be 458.7 tons, a year-on-year decrease of 12.7%, ranking 151st in the country; Down 9.5%, ranked 51st nationally [twenty two]  .
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