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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.

Subei Mongolian Autonomous County, which is under the jurisdiction of Jiuquan City, is located in the northwest of Gansu Province, on the north and south sides of the western end of the Hexi Corridor. The county is divided into two disconnected areas, Nanshan and Beishan, with a total area of 66748 square kilometers. it is bordered by three counties and cities of one country and three provinces (regions). It has jurisdiction over 2 towns and 2 townships, with a total population of 11741 (2012), of which 4446 are Mongolian, accounting for 37.9%. Subei County had nomadic activities in the pre-Qin period; in the Western Han Dynasty, it was incorporated into the territory of the Central Plains Dynasty, belonging to Dunhuang County; after the continuous war, the ownership was changed repeatedly, the local regime and nomadic sphere of influence were crisscross, and the control of the central regime was weak. It belongs to Gansu Province since the Qing Dynasty, and Subei Bureau was set up in the Republic of China in twenty-five years (1937). Liberation in July 1950, 19
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