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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.

Changning County, which belongs to Baoshan City, Yunnan Province, is located in the west of Yunnan Province. In 1933, it was established by Baoshan Yongchang and Shunning Fengqing. Changning County is connected to Fengqing County to the east, Longyang District and Shidian County to the west, Yongde County to the south and Yongping County to the north, and Weishan County to the north. As of 2017, Changning County has jurisdiction over 9 towns and 4 townships, with a total area of 3888 square kilometers and a registered population of 353786. In 2017, the annual gross domestic product (GDP) of Changning County was 10.3618 billion yuan. In October 2017, Changning County was named the National Garden County by the Ministry of Housing and Construction. On April 30, 2019, the people's Government of Yunnan Province decided that Changning County would withdraw from the sequence of poor counties. On February 2, 2019, by the State Administration of traditional Chinese Medicine
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