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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.

Dingcheng District, belonging to Changde City, Hunan Province, formerly known as Changde County, ancient known as Langzhou, is located on the west bank of Dongting Lake in the south of the beautiful Yangtze River. Since Qin bought the county, it has a history of more than 2200 years, and the county is governed by the state, county and government. The topography is mainly plain and hilly land, of which the plain accounts for 50% and the hilly land accounts for 40%. The total area of the region is 2344 square kilometers, including 1.169 million mu of arable land, 80 million mu of lakes and 1.07 million mu of mountain forests. The output of grain, cotton, oil and pig ranks among the top 100 in the country, and the output of cotton, eggs, poultry, aquatic products and fruits ranks first in Hunan Province. The ruins of Daxi Culture, Longshan Culture, Qujialing Culture and Zaoshi Culture have been found many times in the district. The sites of Yuannan Old City, Hanshou Old City and Song Dingzhou City in the Eastern Han Dynasty are still there. As the immigrants from the north moved to the south twice, the Central Plains culture and Huxiang culture mingled with each other, so that the tripod
Airport In Dingcheng District - Changde Taohuayuan Airport
Changde Taohuayuan Airport (Changde Taohuayuan Airport, IATA: CGD, ICAO: ZGCD), located in Taohuayuan Road, Doumu Lake Street, Dingcheng District, Changde City, Hunan Province, China, 13 kilometers northeast of Changde city center, is a 4D-level domestic feeder airport, and Changsha Huanghua International Airport and Zhangjiajie Hehua International Airport are mutually alternate airports   .
On December 10, 1959, construction of Changde Doumu Lake Airport started [twenty three]  ; In December 1960, Changde Doumu Lake Airport opened to traffic   ; On April 15, 1965, Changde Doumu Lake Airport opened for civil aviation [twenty three]  ; On October 28, 1991, the flight area index of Changde Doumu Lake Airport was changed to 3B [twenty four]  ; On August 30, 1996, Changde Doumhu Airport flight area indicator was changed to 4C   ; On August 4, 1999, Changde Doumu Lake Airport was renamed Changde Taohuayuan Airport; in 2015, the flight area indicator of Changde Taohuayuan Airport was changed to 4D   .
As of February 2021, the terminal building of Changde Taohuayuan Airport covers an area of ​​20,165 square meters, including 5,600 square meters for the international terminal area, with a total of 4 boarding bridges; the area of ​​the civil aviation station is about 53,000 square meters, with 4 Class D Aircraft seats and 9 C-class seats; one asphalt runway with a length of 2,600 meters and a width of 45 meters; it can meet the annual passenger throughput of 2.2 million passengers, cargo and mail throughput of 16,000 tons, and transportation take-off and landing of 21,000 sorties. need       .
In 2021, Changde Taohuayuan Airport will handle a total of 1,008,348 passengers, a year-on-year increase of 4.4%, ranking 94th in the country; cargo and mail throughput will be 458.7 tons, a year-on-year decrease of 12.7%, ranking 151st in the country; Down 9.5%, ranked 51st nationally [twenty two]  .
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