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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.

Gaozhou, county-level cities under the jurisdiction of Guangdong Province, important small and medium-sized cities of Beibu Gulf Urban agglomeration in China, economically strong counties (cities) in mountainous areas of Guangdong Province, educational counties (cities) of Guangdong Province, and county medical centers of Guangdong Province, the comprehensive strength of economic and social development has long been in the forefront of Guangdong counties. Gaozhou is located in the southwest of Guangdong Province, southwest of Guangdong, near the South China Sea in the east, Jianjiang Plain in the south, Guangxi in the west, Yunkai Mountain in the north, six counties and cities in Guangdong and Guangxi in the west, Yangchun City and Dianbai District in the east, Maonan District in the south and Xinyi City in the north, bordering Huazhou City in the southwest and Beiliu City in Guangxi in the northwest. Gaozhou, formerly known as Maoming County and Gaozhou County, evolved from the administration of Maoming County by Gaozhou Prefecture (Road) in the Yuan Dynasty, while the place name of "Gaozhou" evolved from "Gaoliang". Before the Sui Dynasty, Gaoliang County was in the area of Enping and Yangjiang; since the Sui and Tang dynasties
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