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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.

Dangchang County belongs to Longnan City, Gansu Province, located in the south of Gansu Province, northwest of Longnan City. Dangchang as a place name began in the Dangchang State established by Liang Qin in the Eastern Jin Dynasty, and changed to Dangzhou in the early Sui Dynasty. Since then, the organizational system has undergone many changes, and Dangchang County was officially established in 1954. Dangchang County has jurisdiction over 11 towns, 14 townships and 336 administrative villages, with a total area of 3331 square kilometers, a total population of 310400 and a resident population of 278700 (2017). Dangchang County is located in the crisscross zone between the Minshan Mountain system and the West Qinling Mountains on the edge of the Qinghai-Tibet Plateau, with an elevation of 1138-4154 meters above sea level, with a temperate continental climate, mild and humid climate, significant vertical climate, and great differences between the north and the south. Natural resources mainly include mineral resources, animal and plant resources, hydropower resources and so on. In 2017, Dangchang County completed production.
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