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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.

Longchuan County, under the jurisdiction of Heyuan City, Guangdong Province, is located in the northeast of Guangdong Province, the northeast of Heyuan City, the upper reaches of Dongjiang and Hanjiang River, Xunwu County and Dingnan County of Jiangxi Province to the north, Wuhua County and Xingning City of Meizhou City to the east, Dongyuan County to the south and Heping County to the west. Laolong Town is the county seat. The county is a subtropical monsoon climate, mild climate, Rain Water abundant, sunny. At the end of 2018, the county has a total area of 3081.31 square kilometers and has jurisdiction over 24 towns, 315 villages and 42 neighborhood committees, with a total population of 986600, a permanent population of 713200 and 341000 overseas Chinese. Longchuan County has a long history and there were human activities as early as the Neolithic Age. Longchuan County was founded in 214BC (33 year of Qin Shihuang), which is one of the most ancient counties in China. Old Zhilong
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