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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.

Hekou District, Dongying City area, located in the north of Shandong Province, north of the Yellow River estuary, is a typical Yellow River Delta geomorphology, high in the south and low in the north, high in the west and low in the east, with a warm temperate monsoon continental climate; it has jurisdiction over 2 streets and 4 towns with a total area of 2267.44 square kilometers and a registered household population of 220258 in 2017. Most of the estuarine areas are retreated to the sea. At the beginning of the Ming Dynasty, from the ocean shop of the Tu Hai River in the ancient river, and from the Daqing River in Jishui to the north of Tiemenguan in Lijin, it extended to the formation of territory and land. From time to time, salt people, fishermen and waterway merchants from other places flow back and forth. Residents began to appear in the decade of Daoguang of the Qing Dynasty (1830). The Qing Dynasty belongs to Zhongxin Township, Zhanhua County, Wuding Prefecture and Yonghe Township, Lijin County. In 2017, the gross domestic product (GDP) of the estuary reached 291.
Airport In Hekou District - Dongying Shengli Airport
Dongying Shengli Airport (Dongying Shengli Airport, IATA: DOY, ICAO: ZSDY), located in Shangfei Avenue, Yongan Town, Kenli District, Dongying City, Shandong Province, China, is 12.5 kilometers away from Dongying Municipal People's Government and Laizhou Bay. It is a 4D-level domestic airport. Regional Airport, COMAC Dongying Civil Aircraft Test Flight Base   .
On November 28, 2001, Dongying Yongan Airport officially resumed flights; on January 15, 2011, Dongying Yongan Airport was renamed Dongying Shengli Airport   ; On February 1, 2018, the 3600-meter runway of Dongying Shengli Airport was opened   .
As of January 2022, the terminal building of Dongying Shengli Airport has an area of ​​25,400 square meters, with 4 boarding bridges; there are 7 aircraft seats on the civil aviation platform, including 6 class C seats and 1 class D seat ;The length of the runway is 3,600 meters and the width is 45 meters; it can meet the needs of annual passenger throughput of 1 million passengers and cargo throughput of 5,000 tons   [twenty one]    .
In 2021, Dongying Shengli Airport will handle a total of 682,129 passengers, a year-on-year increase of 49.8%, ranking 112th in the country; cargo and mail throughput will be 705.2 tons, a year-on-year increase of 8.7%, ranking 134th in the country; aircraft movements will be 31,569 , a year-on-year decrease of 21.15%, ranking 73rd in the country   .
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