• Chicago
  • rang tang 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.

Rangtang is located in longitude 100 °31 °29'E and latitude 31 °29 °32 °41 °N, in the east of the Qinghai-Tibet Plateau, in the upper reaches of the Dadu River, in the west of Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province, bordering Malkang City and Aba County in the east and northeast, Jinchuan County in the south, Seda County, Luhuo County and Daofu County in Ganzi Prefecture in the west and south, and Banma County in Qinghai Province in the north. The county seat is 3285 meters above sea level. Rangtang was founded in 1958. The name of the county comes from a natural village in the country. The village is located on the mountain, and its mountain is shaped like the "Tibetan Bhara Bodhisattva". The Tibetan-Chinese Dictionary: "Zhanbala, enlightened by free translation." The Sanskrit sound is translated into Yan Bora. The old translation is Bulu King Kong, the name of the God of Wealth. The Dictionary of Tibetan-Chinese University is recorded again: "Building, treasure building, victory building." A symbol on the roof of the palace
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