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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.

Longtan District is one of the areas under the jurisdiction of Jilin City, Jilin Province, which gets its name because it is located in the foothills of Longtan. Located in the northeast of Jilin City, the north bank of Songhua River, Longtan District borders Jiaohe City in the east, Fengman District in the southeast, Changyi District in the south and west, and Shulan City in the north. Longtan District covers an area of 1208.9 square kilometers and cultivated land covers an area of 292.27 square kilometers. In 2010, the resident population was 527532, including more than 20 ethnic groups such as Han and Yao. In 2016, Longtan has jurisdiction over 13 streets, 5 towns and 1 township. In 2016, the GDP of Longtan District reached 39.75 billion yuan, an increase of 7 percent over 2015.
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