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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.

Changge City, which belongs to Xuchang City, Henan Province, is a county-level city under Xuchang's jurisdiction; it is adjacent to Xuchang City-Jian'an District to the south, Zhengzhou Airport area to the north and Xinzheng International Airport to the north, between latitude 34 °20km north and longitude 113o 34km east. It has a total area of 650square kilometers and a resident population of 679300 (2016). It has jurisdiction over 4 streets and 12 towns. Changge City has two industrial agglomeration zones (Changge Economic and technological Development Zone and Changge Dazhou Industrial agglomeration Zone). By 2015, Changge City has built 10 national and provincial enterprise technology centers and 2 postdoctoral workstations. GE, head of China's top 100 industrial counties, ranked 54th in 2017. The main business income of industry in 2016 is 215.8 billion, the first in Henan county.
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