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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.

Tongan District (ancient Tongan County, Quanzhou Prefecture) is one of the six districts of Xiamen, also known as "Silver City". It was bought in the third year of Taikang in the Western Jin Dynasty (AD 282) and soon abandoned. Tang Zhenyuan nineteen years (803) analysis of Nanan County Datong Field, Tang Changxing four years after the five dynasties (933). Tianfu four years after the Jin Dynasty (939), the same field as Tongan County, is the capital of Quanzhou. In 1958, Tongan County was divided into Xiamen City, Tongan County was divided into Jinjiang area in June 1970, and Xiamen City in June 1973. The implementation of county governance, because the county seat is in the shape of a waist silver ingot, it is called "Silver City". In history, it had jurisdiction over Jinmen, Xiamen, Jimei District and a small part of the eastern part of Zhangzhou Taiwan Investment Zone. After liberation, the administrative area was changed several times and was assigned to it in 1973.
Airport In Tong'an District - Xiamen Gaoqi International Airport
Xiamen Gaoqi International Airport (Xiamen Gaoqi International Airport, IATA: XMN, ICAO: ZSAM), located in Huli District, Xiamen City, Fujian Province, China, is a 4E-class civil international airport and an important regional aviation hub on the southeast coast of China. One of the two major trunk airports.  
Xiamen Gaoqi International Airport was opened to traffic in 1983. In November 1996, Terminal 3 of the airport was put into use. In December 2014, Terminal 4 was officially opened, and the annual passenger handling capacity of the airport rose to 27 million.   
According to information on the airport's official website in September 2017, Xiamen Gaoqi International Airport has a 3,400-meter-long runway, 2 parallel taxiways and 10 contact roads; the total area of ​​the apron is 770,000 square meters, with 89 parking spaces; the terminal building The total construction area is 237,800 square meters; a total of 109 cities and 182 domestic and overseas routes have been opened.  
In 2016, Xiamen Gaoqi International Airport completed a passenger throughput of 22.7376 million passengers, a year-on-year increase of 4.2%; cargo and mail throughput of 328,400 tons, a year-on-year increase of 5.7%; take-off and landing sorties of 183,500 vehicles, a year-on-year increase of 1.9%, ranking first in China respectively. 11, 12, 13.  
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