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Columbus (/kəˈlʌmbəs/) is the state capital and the most populous city in the U.S. state of Ohio. With a 2020 census population of 905,748, it is the 14th-most populous city in the U.S., the second-most populous city in the Midwest, after Chicago, and the third-most populous state capital. Columbus is the county seat of Franklin County; it also extends into Delaware and Fairfield counties. It is the core city of the Columbus metropolitan area, which encompasses 10 counties in central Ohio. The metropolitan area had a population of 2,138,926 in 2020, making it the largest entirely in Ohio[a] and 32nd-largest in the U.S.

Columbus originated as numerous Native American settlements on the banks of the Scioto River. Franklinton, now a city neighborhood, was the first European settlement, laid out in 1797. The city was founded in 1812 at the confluence of the Scioto and Olentangy rivers, and laid out to become the state capital. The city was named for Italian explorer Christopher Columbus. The city assumed the function of state capital in 1816 and county seat in 1824. Amid steady years of growth and industrialization, the city has experienced numerous floods and recessions. Beginning in the 1950s, Columbus began to experience significant growth; it became the largest city in Ohio in land and population by the early 1990s. The 1990s and 2000s saw redevelopment in numerous city neighborhoods, including Downtown.

Henan Mongolian Autonomous County is the only Mongolian Autonomous County in Qinghai Province, commonly known as "Henan Mengqi", which has the highest proportion of Mongolian population in China. It is located in the southeast of Qinghai Province, facing Xiahe County and Luqu County of Gannan Tibetan Autonomous Prefecture of Gansu Province to the east, Maqu County of Gannan Tibetan Autonomous Prefecture of Gansu Province to the south, Maqin County of Guoluo Tibetan Autonomous Prefecture of Qinghai Province and Tongde County of Hainan Prefecture in the southwest, adjacent to Zeku County in the north, located in the joint of three provinces of Qinghai and Gansu, known as the south gate of Qinghai Province. The county covers a total area of 6997.45 square kilometers and is 3600 meters above sea level. It has jurisdiction over one town, four townships, two communities, 39 animal husbandry committees, 135 animal husbandry cooperatives and four Tibetan Buddhist monasteries. As of 2011, the total population was 40, 000, of which 93.21% were Mongolians. Henan County is the largest organic animal husbandry student in China.
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