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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.

Changyi City is a county-level city under the jurisdiction of Weifang City. it is located in the northwest of Shandong Peninsula, downstream of Weihe River, on the bank of Laizhou Bay, between 36 °25 degrees north latitude, 37 °08 degrees north latitude and 119 °13 degrees east longitude. Pingdu County is bounded by Jiaolai River in the east, Gaomi County and Anqiu County in the south, Fangzi District and Hanting District in Weifang City in the west, and Laizhou Bay in the north, with a total urban area of 1578.7 square kilometers. As of 2016, Changyi has jurisdiction over 3 streets and 6 towns. In 2015, Changyi had a total population of 585000. In 2016, the city's GDP reached 40 billion yuan, and the per capita disposable income in urban and rural areas reached 31000 yuan and 16000 yuan, respectively. Changyi belongs to the economic circle around the Bohai Sea, which is the coastal external area determined by the State Council.
Airport In ChangYi - Weifang Airport
Weifang Nanyuan Airport (Weifang Nanyuan Airport, IATA: WEF, ICAO: ZSWF), located at No. 1 Airport Road (Nanyuan Street), Kuiwen District, Weifang City, Shandong Province, China, 8 kilometers north of Weifang City Center, is a 4D-level military and civilian shared feeder airport   .
On April 4, 1996, Weifang Nanyuan Airport officially opened civil aviation business; on April 19, 2004, HNA Group Weifang Nanyuan Airport Co., Ltd. was unveiled; on August 3, 2015, Weifang Nanyuan Airport's air port temporarily open   .
As of April 2020, the terminal area of ​​Weifang Nanyuan Airport is 19,182 square meters, with 1 boarding bridge; the civil aviation station area is 34,000 square meters, with 6 civil aviation seats, including 2 class D seats, 4 C-class seats; the runway is 2,600 meters long and 48 meters wide; it can meet the needs of an annual passenger throughput of 320,000 passengers     .
In 2021, Weifang Nanyuan Airport will handle a total of 680,077 passengers, a year-on-year increase of 39.7%, ranking 113th in the country; cargo and mail throughput will be 31,820.1 tons, a year-on-year decrease of 1.5%, ranking 46th in the country; aircraft take-offs and landings will be 8,710 , a year-on-year increase of 21.2%, ranking 133rd in the country   .
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