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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.

Xincai County, known as Caizhou in ancient times, is directly administered by Henan Province, located in the southeast of Henan Province, with a total area of 1453 square kilometers, cultivated land of 1.48 million mu, 20 townships, 3 streets and 361 village committees. Xincai County is a national advanced county in grain production, advanced in scientific and technological progress, direct administration county in Henan Province, forestry ecological county in Henan Province, Shuangyong model county in Henan Province, provincial garden city in Henan Province, and sanitary city in Henan Province. In the early years of the Xia Dynasty, the descendant of Emperor Yan and the inventor of Chinese well sinking, Bo Yi, who assisted Dayu in flood control, was named Lu Hou and established Lu here. During the Spring and Autumn period (529 BC), Cai Pinghou moved the capital to Gulu, which is known as Xin Cai Guo, hence the name Xin Cai. In 2017, Xincai County has a total population of 1.1412 million. August 1, 2018, Henan Provincial Government
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