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  • Yijun County

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.

Yijun County, which belongs to Tongchuan City, Shaanxi Province, is located in the middle of Shaanxi Province, in the north of Tongchuan City, and at the junction of Guanzhong Plain and Northern Shaanxi Loess Plateau. The county seat is 120km south from the provincial capital Xi'an and 27km north from the Huangdi Mausoleum of Xuanyuan, with a total area of 1531 square kilometers. National Highway 210 and Tonghuang first-class highway pass through the border, known as the "flyover from Guanzhong to northern Shaanxi". Yijun County is not only named because of Yijun water, but also because it is suitable for kings to spend the summer. There are Yangshao cultural sites, Pengzu hometown, Northern Wei grottoes, Jiangnu tear Spring, Yunmeng Mountain Taoist resort, the warring States and Wei Great Wall, among which Yijun and the warring States Wei Great Wall was included in the World Cultural Heritage list of the Great Wall of China. As of 2018, Yijun County has jurisdiction over 1 street, 6 towns and 1 township. In 2017, the resident population of Yijun County was 92100.
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