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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.

Hohhot, commonly known as Hohhot, formerly known as Guisui, is the capital of Inner Mongolia Autonomous region, the political, economic and cultural center of Inner Mongolia, and an important central city in the border areas of northern China approved by the State Council. By 2018, the city had jurisdiction over four districts, four counties and one flag, with a total area of 17224 square kilometers, a built-up area of 260 square kilometers, a resident population of 3.126 million, and an urban population of 2.183 million, with an urbanization rate of 69.8%. Located in North China, the northern frontier and the interior of Eurasia, Hohhot is the core city of the Hubao silver urban agglomeration and the central city of the Hubao-Hubei urban agglomeration. it is an important bridge connecting the Yellow River economic belt, the Eurasian continental bridge and the economic region around the Bohai Sea. it is also an important open central city along the border that China opens to Mongolia and Russia.
Airport In Huhehaote、Huhehot - Hohhot Baita International Airport
Hohhot Baita International Airport (Hohhot Baita International Airport, IATA: HET; ICAO: ZBHH) is located on Airport Road, Saihan District, Hohhot, Inner Mongolia Autonomous Region, China; 14.3 kilometers away from the city center, it is a 4E-class civil international airport; it is the first in Inner Mongolia Autonomous Region big aviation hub   .
Hohhot Baita International Airport was officially completed and opened to navigation on October 1, 1958, named Hohhot Baita Airport; it was renamed Hohhot Baita International Airport on December 27, 2004; the first phase of the expansion project was completed on July 16, 1987; The second-phase expansion project was completed in July 1997; the third-phase expansion project was completed on July 28, 2007.  
According to the official website of the airport in October 2018, Hohhot Baita International Airport has a terminal building, T1 (domestic and international in China), with a total of 54,400 square meters; a runway with a length of 3,600 meters; 43 parking positions   ;A total of 124 domestic and international routes have been opened in China, covering 91 cities   .
In 2019, the passenger throughput of Hohhot Baita International Airport was 13.1518 million passengers, a year-on-year increase of 68.2%; the cargo and mail throughput was 46,100 tons, a year-on-year increase of 14.8%; the number of takeoffs and landings was 112,100, a year-on-year increase of 6.5%; 32nd, 41st, 32nd   .
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