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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.

Caidian District, subordinate to Wuhan City, Hubei Province, is located in the western suburb of Wuhan City, located in the triangle zone of the confluence of the Han River and the Yangtze River, in the east of the Jianghan Plain, near the Han River in the north, and dependent on the lips and teeth of the East and West Lake District; facing the Tongshun River in the south, connected by mountains and rivers in Hannan District; bordering the Yangtze River in the east and facing Jiangxia District across the water; bordering Hanchuan City in the west; Hanyang District in the northeast; Xiantao City in the southwest. It is between 113o 41mm east longitude and 114o 13' north latitude, with a total area of 1093.57 square kilometers. By 2018, Caidian District had jurisdiction over 12 streets and 1 township, and had 4 management committees with a resident population of 466600, realizing a GDP of 47.607 billion yuan, of which the added value of the primary industry was 4.298 billion yuan.
Airport In Caidian District - Wuhan Tianhe International Airport
Wuhan Tianhe International Airport (Wuhan Tianhe International Airport, IATA: WUH, ICAO: ZHHH), located in Huangpi District, Wuhan City, Hubei Province, China, 25 kilometers away from the center of Wuhan, is the first 4F civil international airport in central China   , one of the eight major regional hub airports in China, an airport with international scheduled flights, and a first-class air port open to the outside world   . In January 2019, the airport began to implement a 144-hour transit visa-free policy.
The field was officially completed and open to navigation on April 15, 1995, named "Wuhan Tianhe Airport"; it was identified as an international airport in 2000; the second phase of the expansion project was completed in April 2008. The third-phase expansion project was substantially started in June 2013, passed the completion acceptance in June 2017, and passed the industry acceptance in August 2017 and put into use.  
As of August 2020, Wuhan Tianhe International Airport has 1 terminal building with a total area of ​​495,000 square meters; 2 runways with lengths of 3,400 meters and 3,600 meters respectively; a total of 117 seats, and an air cargo terminal of 56,042 square meters meters; it can meet the needs of annual passenger throughput of 35 million person-times, cargo and mail throughput of 440,000 tons, and aircraft take-off and landing of 404,000 sorties.   
In 2019, the passenger throughput of Wuhan Tianhe International Airport was 27.15 million, a year-on-year increase of 10.8%; the cargo and mail throughput was 243,000 tons, a year-on-year increase of 9.8%; the number of transportation movements was 203,000, a year-on-year increase of 8.2%.  
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