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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.

Kang County, which belongs to Longnan City, Gansu Province, is located in the southeast of Gansu Province, southeast of Longnan City, and at the junction of Gansu, Sichuan and Shaanxi provinces. Kang County was known as Connecticut in ancient times, and was later incorporated into Wuzhou (Jizhou) after the Northern Zhou Dynasty, and Zhikang County in 1929. Kang County has jurisdiction over 18 towns and 3 townships, with a total area of 2958.46 square kilometers and a total population of 202000 (2015). In the Longnan Mountains on the south side of the West Qinling Mountains in Kangxian County, the elevation is between 560-2483 meters above sea level, which belongs to the transition from subtropical zone to warm temperate zone, with abundant rainfall, humid climate, sufficient light and forest coverage of 66.7%. It is known as "Longshang Jiangnan" and "Longshang Xishuangbanna". The natural resources of Kangxian County include water resources, biological resources, mineral resources and so on, with a total output value of 1.922 billion yuan in 2015. Kangxian County
Travel Guides In Kangxian County
Travel Notes In Kangxian County