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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.

Danyang, Zhenjiang City, Jiangsu Province, in charge of county-level cities, was called qu'an in ancient times, and got its name from the meaning of "Danfeng Chaoyang". Located in the Yangtze River Delta, located in the south of Jiangsu Province, belongs to the Taihu Lake basin. Danyang is one of the birthplaces of Wu culture. It was founded in the warring States period and is the hometown of Qi and Liang dynasties. Danyang culture belongs to Wu Yue culture, and the people of Danyang belong to the people of Jiangsu and Zhejiang provinces. Rivers crisscross in Danyang, 122 Provincial Highway, 312 National Highway, Shanghai-Nanjing Expressway, Zhendan Expressway, Beijing-Shanghai Railway, Beijing-Shanghai High-speed Railway, Shanghai-Nanjing Intercity Railway, Beijing-Hangzhou Grand Canal. In 1987, it was approved by the State Council to withdraw counties and build cities, and was listed as a coastal open city. Danyang is the world's largest lens production base, known as the "hometown of Chinese glasses" Meiji. The economic strength of Danyang ranks No. 1 in the comprehensive competitiveness of county-level cities in China in 2013.
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