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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.

Gaotai County, which belongs to Zhangye City, Gansu Province, is located in the middle of Hexi Corridor and the lower reaches of Heihe River. it has been known as "Hexi key, five counties throat" since ancient times. The terrain is high in the north and south and low in the middle, with the northern foot of the Qilian Mountains in the south, the Heli Mountain in the north, the oasis plain in the middle, and the Heihe River running through the county. The county has a total land area of 4346.61 square kilometers and has jurisdiction over 9 towns. By the end of 2017, Gaotai County had a total population of 158000. Gaotai County has a long history, Han Wudi Yuanding six years (111 years ago) set the table as a county, when the "Silk Road" must pass. In the first year of Xiankang in the Eastern Jin Dynasty (335 BC), Zhang Jun of Qianliang set up Jiankang County in Camel City. Qing Yongzheng three years (1725), and Gaotai, town Yi Shou Qianhu Gaotai County. There are ancient ruins of Camel City and Xu Sanwan City in the territory.
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