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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.

Zhenglan Banner is a flag belonging to Xilingol League of Inner Mongolia Autonomous region. it is located in the south of Inner Mongolia Autonomous region and the southern end of Xilingol League in Paradise grassland. It is only 180 kilometers away from the capital Beijing. It is the nearest typical grassland area to Beijing. Longitude 116.02 °east, latitude 42.25 °north. Zhenglan Banner has a total area of 10182 square kilometers, a total population of 83000 and a peak population of 105000. It is a multi-ethnic area dominated by Mongolians. It is Hunshandake sandy land in the north, showing the natural scenery of sandy grassland, and low mountains and hills in the south, showing the beauty of meadow steppe. Zhenglan Banner is rich in water resources, including 21 rivers and 147 lakes. The banner is rich in wild animal and plant resources. There are 708 species of plants and rare fields in the banner.
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