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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.

Longxian, which belongs to Baoji City, Shaanxi Province, is called Longzhou in ancient times, because it is located in Dongzaka, Longshan. It is located in the west of Guanzhong Plain and northwest of Baoji City. It faces Qianyang to the east, Chencang District to the south and Qingshui, Zhangjiachuan, Huating, Chongxin and Lingtai five counties in the northwest. It is between longitude 106o 26mm 32 "- 107o 811" east and latitude 34o 35m 17 "- 35o 6m 45" N, with a width of 57.6km from north to south and 59.7km from east to west, with a total area of 2285 square kilometers. Longxian is called Longzhou in ancient times, because it is located on the east slope of Longshan. Qin Xianggong established the capital, and Longguan was established in the Han Dynasty, which is known as "the capital of Qin and Han pass". It is the first male pass on the ancient Silk Road to the west of Chang'an. Longxian County has a good ecology, with 60% forest coverage and 49 large and small rivers, which is known as the "faucet of Guanzhong".
Travel Guides In Longxian County
Travel Notes In Longxian County