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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.

Tianchang, a county-level city in Anhui Province, is hosted by Chuzhou and is located in the eastern part of Anhui Province. it is surrounded on three sides by Jiangsu Gaoyou City, Yizheng City, Liuhe District, Jinhu County and Xuyi County. It is a member of the county-level city of Nanjing Metropolitan Circle and one of the two wings in the industrial transfer demonstration area of Wanjiang City Belt. It is known as "the East Gate of Anhui". It covers an area of 1770 square kilometers and has a registered population of 635921 (2016), of which the urban population is about 200000. It has jurisdiction over 14 towns and 1 street. Tianchang County, founded in 742 AD, is a county specially designed by Tang Xuanzong Li Longji to commemorate his birthday Qianqiu Festival. In memory of the late General Luo Binghui of the New fourth Army, he twice changed his name to "Binghui County". There are Zhu Shouchang and Xuan
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