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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.

Tongling, a prefecture-level city in Anhui Province, is located in the south-central part of Anhui Province and the lower reaches of the Yangtze River, with Hefei to the north, Chizhou to the south, Wuhu to the east and Anqing to the west, with a total area of 3008 square kilometers. Tongling gets its name from copper and flourishes with copper. it is known as "the ancient copper capital of China and the contemporary copper base". The history of copper mining began in the Shang and Zhou dynasties, flourished in the Han and Tang dynasties, and lasted for more than 3500 years. The first furnace of copper water and the first copper ingot in New China came from Tongling. The first copper industrial base was built in Tongling, and the first copper stock was issued in Tongling. In 2018, Tongling had jurisdiction over three municipal districts and one county, with a resident population of 1.629 million, achieving a GDP of 122.24 billion yuan, of which
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