• Columbus
  • Tanchang County

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.

Dangchang County belongs to Longnan City, Gansu Province, located in the south of Gansu Province, northwest of Longnan City. Dangchang as a place name began in the Dangchang State established by Liang Qin in the Eastern Jin Dynasty, and changed to Dangzhou in the early Sui Dynasty. Since then, the organizational system has undergone many changes, and Dangchang County was officially established in 1954. Dangchang County has jurisdiction over 11 towns, 14 townships and 336 administrative villages, with a total area of 3331 square kilometers, a total population of 310400 and a resident population of 278700 (2017). Dangchang County is located in the crisscross zone between the Minshan Mountain system and the West Qinling Mountains on the edge of the Qinghai-Tibet Plateau, with an elevation of 1138-4154 meters above sea level, with a temperate continental climate, mild and humid climate, significant vertical climate, and great differences between the north and the south. Natural resources mainly include mineral resources, animal and plant resources, hydropower resources and so on. In 2017, Dangchang County completed production.
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