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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.

Qianxi County, which belongs to Tangshan City, Hebei Province, is located at the southern foot of Yanshan and at the foot of the Great Wall, the hinterland of Beijing, Tianjin and Tang Dynasty, with an area of 1439 square kilometers, with a natural pattern of "seven mountains, one water and half field, half-divided roads and manors". It has jurisdiction over 17 townships, 417 administrative villages, 1 subdistrict office, 11 neighborhood committees, with a total population of 410000, and 21 Jingzhong East Street, where the government is stationed. Qianxi County was built in 1946, which got its name from the analysis of Qianxi County in the west of Qianan. Five or six thousand years ago, human beings have lived here. Qianxi is the birthplace of Yanzhao culture and Luanhe culture, with the Neolithic cultural Xizhai site more than 7000 years ago, the most complete brick kiln of the Ming Great Wall and the best preserved Yumuling Great Wall. Song Zhe Yuan, Zhang Zizhong and other famous generals fought to the death against the Japanese aggressors at Xifengkou.
Airport In Qianxi County - Tangshan Sannvhe Airport
Tangshan Sannvhe Airport (Tangshan Sannvhe Airport, IATA: TVS, ICAO: ZBSN), located on Airport Road, Shigezhuang Town, Fengrun District, Tangshan City, Hebei Province, China, 19.5 kilometers southeast of Tangshan city center, is a 4C-level military-civilian joint regional airport   .
On February 26, 2009, the Tangshan Airport of the Air Force officially started the military-civilian reconstruction and expansion project   ; On June 1, 2009, Tangshan military-civilian combined airport was named "Tangshan Sannvhe Airport"   ;On July 13, 2010, Tangshan Sannvhe Airport officially opened civil aviation business   .
As of February 2021, the terminal area of ​​Tangshan Sannvhe Airport is 6,187 square meters, with 3 boarding bridges; the civil aviation station area is 32,000 square meters, with 8 seats, including 2 class B seats, 6 C-class seats; the runway is 2,700 meters long and 50 meters wide; it can meet the needs of an annual passenger throughput of 1 million passengers and a cargo and mail throughput of 3,200 tons       .
In 2021, Tangshan Sannvhe Airport will handle a total of 394,365 passengers, a year-on-year decrease of 9.7%, ranking 146th in the country; cargo and mail throughput will be 291.7 tons, a year-on-year decrease of 73.1%, ranking 157th in the country; aircraft takeoffs and landings will be 4,610 Flights, down 13.5% year-on-year, ranking 168th in the country   .
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