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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.

Tongchuan is a municipality under the jurisdiction of Shaanxi Province, which is located in the junction zone of central Shaanxi Province, Guanzhong Basin and Northern Shaanxi Plateau, adjacent to Yan'an, Weinan and Xianyang. Tongchuan is a continental monsoon climate with four distinct seasons and obvious monthly changes in air temperature. the area is 3882 square kilometers, and the city has jurisdiction over three districts and one county. In 2017, the city's resident population was 833400. Tongchuan has convenient transportation, which is an important part of the Guanzhong economic belt, and it is a necessary place leading to the Mausoleum of the Yellow Emperor and Yan'an, the holy place of revolution. Tongchuan New area is 68 kilometers away from Xi'an and 72 kilometers away from Xi'an Xianyang International Airport. Xi'an-Huangling Expressway passes through the border, and the two branch railways of Xiantong and Meiqi are connected with the Longhai artery. In 2017, Tongchuan achieved a GDP of 34.859 billion yuan, of which the added value of the primary industry
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