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Washington, D.C., formally the District of Columbia, also known as Washington or D.C. or locally simply as the District, is the capital city and federal district of the United States. It is located on the east bank of the Potomac River, which forms its southwestern and southern border with the U.S. state of Virginia, and it shares a land border with the U.S. state of Maryland on its other sides. The city was named for George Washington, a Founding Father and the first president of the United States, and the federal district is named after Columbia, the female personification of the nation. As the seat of the U.S. federal government and several international organizations, the city is an important world political capital. It is one of the most visited cities in the U.S., with over 20 million annual visitors as of 2016.

The U.S. Constitution provides for a federal district under the exclusive jurisdiction of Congress; the district is not a part of any U.S. state (nor is it one itself). The signing of the Residence Act on July 16, 1790, approved the creation of the capital district located along the Potomac River near the country's East Coast. The City of Washington was founded in 1791, and Congress held its first session there in 1800. In 1801, the territory, formerly part of Maryland and Virginia (including the settlements of Georgetown and Alexandria), officially became recognized as the federal district. In 1846, Congress returned the land originally ceded by Virginia, including the city of Alexandria; in 1871, it created a single municipal government for the remaining portion of the district. There have been efforts to make the city into a state since the 1880s, a movement that has gained momentum in recent years, and a statehood bill passed the House of Representatives in 2021.

Lai'an County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province. Founded in the 26 year of Qin Shihuang (221 BC), it is called Jianyang County. After several Yi county name, to the first year of Zhongxing in the Southern Tang Dynasty (958), named Lai'an County. Lai'an County has jurisdiction over 12 townships, two provincial economic development zones, two national 4A tourist attractions and a national wetland park, with a land area of 1481 square kilometers and a total population of 490900. Lai'an County, adjacent to Nanjing Jiangbei New area, a national new area, is the core layer of Nanjing metropolitan area and an important gateway of Nanjing Jiangbei. The Chahe town under its jurisdiction is adjacent to Nanjing High-tech Development Zone and is close to Nanjing Metro Line 3 Forest Farm Station. Only 12 kilometers away from Nanjing Yangtze River Bridge. In 2017, the annual gross domestic product (GDP) of Lai'an County reached 15.94 billion yuan.
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