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Chicago (/ʃɪˈkɑːɡoʊ/ (listen) shih-KAH-goh, locally also /ʃɪˈkɔːɡoʊ/ shih-KAW-goh) is the most populous city in the U.S. state of Illinois and the third-most populous in the United States, after New York City and Los Angeles. With a population of 2,746,388 in the 2020 census, it is also the most populous city in the Midwest. As the seat of Cook County (the second-most populous U.S. county), the city is the center of the Chicago metropolitan area, one of the largest in the world.

On the shore of Lake Michigan, Chicago was incorporated as a city in 1837 near a portage between the Great Lakes and the Mississippi River watershed. It grew rapidly in the mid-19th century; by 1860, Chicago was the youngest U.S. city to exceed a population of 100,000. The Great Chicago Fire in 1871 destroyed several square miles and left more than 100,000 homeless, but Chicago's population continued to grow to 503,000 by 1880 and then doubled to more than a million within the decade. The construction boom accelerated population growth throughout the following decades, and by 1900, less than 30 years after the fire, Chicago was the fifth-largest city in the world. Chicago made noted contributions to urban planning and zoning standards, including new construction styles (such as, Chicago School architecture, the development of the City Beautiful Movement, and the steel-framed skyscraper).

Chicago is an international hub for finance, culture, commerce, industry, education, technology, telecommunications, and transportation. It is the site of the creation of the first standardized futures contracts, issued by the Chicago Board of Trade, which today is part of the largest and most diverse derivatives market in the world, generating 20% of all volume in commodities and financial futures alone. O'Hare International Airport is routinely ranked among the world's top six busiest airports according to tracked data by the Airports Council International. The region also has the largest number of federal highways and is the nation's railroad hub. The Chicago area has one of the highest gross domestic products (GDP) in the world, generating $689 billion in 2018. The economy of Chicago is diverse, with no single industry employing more than 14% of the workforce. It is home to several Fortune 500 companies, including Archer Daniels Midland, Conagra Brands, Exelon, JLL, Kraft Heinz, McDonald's, Mondelez International, Motorola Solutions, Sears, and United Airlines Holdings.

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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