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Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Changyang Tujia Autonomous County is an autonomous county under the jurisdiction of Yichang City, Hubei Province. Located in the mountainous area of southwestern Hubei, the middle and lower reaches of the Yangtze River and Qingjiang River, it is a special county that integrates the old, the young, the mountain, the poor and the storehouse. In July 1984, Changyang Tujia Autonomous County was established with the approval of the State Council of China. There are 23 ethnic groups, including Tujia, Han, Miao, Manchu, Mongolian, Dong and Zhuang, of which Tujia accounts for about 51%. The county government is stationed in Longzhouping Town. Changyang Tujia Autonomous County is located in the mountainous area of southwestern Hubei and the middle and lower reaches of the Yangtze River and Qingjiang River. it spans 110 °21'to 111 °21 'east longitude and 30 °12' to 30 °46 °north latitude; it is adjacent to Yidu to the east, Wufeng Tujia Autonomous County to the south, Badong County near the Yangtze River in Enshi Tujia and Miao Autonomous Prefecture to the west, and Zigui Heyi to the north.
Airport In Changyang Tujia Autonomous County - Yichang Three Gorges Airport
Yichang Sanxia Airport (Yichang Sanxia Airport, IATA: YIH, ICAO: ZHYC) is located at the junction of Yiting District, Yiling District and Zhijiang City, Yichang City, Hubei Province, China, 26 kilometers away from the city center and 55 kilometers away from the Three Gorges Dam   , is a 4D-level international tourist feeder airport, an important supporting project of the Three Gorges Project, and an international hub airport in the Three Gorges region   .
Yichang Three Gorges Airport was approved by the State Council and the Central Military Commission on January 18, 1993.   ;The construction officially started in September 1994, and passed the national completion inspection in October 1996. On December 28, 1996, it obtained the airport use permit and officially opened to air.   ; On June 23, 2022, the airport T2 terminal will be opened   .
According to the official website of the airport in February 2022, the terminal area of ​​Yichang Three Gorges Airport is 14,816 square meters, the area of ​​the air cargo terminal is 96 square meters, and the civil aviation station has 21 aircraft seats; the runway is 3,200 meters long and 45 meters wide   .  
In 2018, Yichang Three Gorges Airport handled a total of 2,948,700 passengers, 24,800 aircraft movements, and 16,900 tons of cargo and mail, a year-on-year increase of 31.41%, 27.17%, and 25.42% respectively.  
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