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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.

Shuangtaizi District, which belongs to Panjin City, Liaoning Province, is located in the south of Songliao Plain, the lower reaches of Liao River and the coast of Bohai Sea. The center is located in longitude 121 °2 "122 °30" east and latitude 40 °39 "40 °37 'north. Shuangtaizi District has a total area of 121square kilometers and has jurisdiction over 8 streets and 2 towns with a total population of 220000 (2015). By 2014, the GDP of Shuangtaizi District had reached 15.03 billion yuan. Shuangtaizi District has Liaohe Forest of Steles, Lakeside Park and other scenic spots. Chen Baoku, current secretary of the Shuangtaizi District CPC Committee, Zhang Guojun, chairman of the standing Committee of the District people's Congress, and Li Jifeng, the district mayor. On November 14, 2019, Shuangtaizi District was rated as the third batch of national ecological civilization construction demonstration areas by the Ministry of Ecological Environment.
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