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  • Dangtu County

Indianapolis (/ˌɪndiəˈnæpəlɪs/), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Marion County was 977,203 in 2020. The "balance" population, which excludes semi-autonomous municipalities in Marion County, was 887,642. It is the 15th most populous city in the U.S., the third-most populous city in the Midwest, after Chicago and Columbus, Ohio, and the fourth-most populous state capital after Phoenix, Arizona, Austin, Texas, and Columbus. The Indianapolis metropolitan area is the 33rd most populous metropolitan statistical area in the U.S., with 2,111,040 residents. Its combined statistical area ranks 28th, with a population of 2,431,361. Indianapolis covers 368 square miles (950 km2), making it the 18th largest city by land area in the U.S.

Indigenous peoples inhabited the area dating to as early as 10,000 BC. In 1818, the Lenape relinquished their tribal lands in the Treaty of St. Mary's. In 1821, Indianapolis was founded as a planned city for the new seat of Indiana's state government. The city was platted by Alexander Ralston and Elias Pym Fordham on a 1-square-mile (2.6 km2) grid next to the White River. Completion of the National and Michigan roads and arrival of rail later solidified the city's position as a manufacturing and transportation hub. Two of the city's nicknames reflect its historical ties to transportation—the "Crossroads of America" and "Railroad City". Since the 1970 city-county consolidation, known as Unigov, local government administration operates under the direction of an elected 25-member city-county council headed by the mayor.

Indianapolis anchors the 29th largest economic region in the U.S., based primarily on the industries of trade, transportation, and utilities; professional and business services; education and health services; government; leisure and hospitality; and manufacturing. The city has notable niche markets in amateur sports and auto racing. The city is home to three Fortune 500 companies, two major league sports clubs (Colts and Pacers), five university campuses, and several museums, including the world's largest children's museum. However, the city is perhaps best known for annually hosting the world's largest single-day sporting event, the Indianapolis 500. Among the city's historic sites and districts, Indianapolis is home to the largest collection of monuments dedicated to veterans and war casualties in the U.S. outside of Washington, D.C.

Dangtu County, which belongs to Maanshan City, Anhui Province, is located in the east of Anhui Province and the east bank of the lower reaches of the Yangtze River. It is bordered by Bowang District and Shijiu Lake to the east, Lishui District and Gaochun District in Nanjing City, Jiangsu Province to the east, the Yangtze River to the west, across the river to Hexian County, Wuhu County and Xuancheng City to the south, and Yushan District to the north. Dangtu County has a history of more than 2200 years. Danyang County was established in the Qin Dynasty, and it was named Dangtu in the ninth year of Sui Kaihuang (589). In history, the county seat was the seat of Taiping Prefecture in Song Dynasty, Taiping Mansion in Ming and Qing dynasties, Yangtze River navigator in Qing Dynasty and Anhui Science and Government Office. Since the Qin Dynasty, it has attracted more than 600 poets to leave more than 1000 popular poems here. Xie Kui, a great poet of the Southern Dynasty, called it "the capital of mountains and rivers". The poem fairy Li Bai visited Dangtu seven times and wrote 56 unique poems such as "Wangtianmen Mountain".
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