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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.

Huaian County, which belongs to Zhangjiakou City, Hebei Province, is located in the northwest of Hebei Province, at the junction of Shanxi, Hebei and Inner Mongolia provinces (regions). It is located at the intersection of Beijing-Tianjin-Hebei Metropolitan area and Shanxi-Hebei-Inner Mongolia Economic Circle. It is known as the "Golden Triangle". Huaian County has a long history and was established as early as the Spring and Autumn and warring States period. Tang Muzong was called Huaian County in the second year of Changqing, that is, AD 822, with the meaning of "benevolence was implemented by the court and the people were gracious and safe". The county has a vast territory, high in the west and low in the east, belonging to a shallow mountain and hilly area. The area covers an area of 1706 square kilometers, with an available land area of 1.5 million mu, including 600000 mu of arable land. It has jurisdiction over 4 towns and 7 townships, 273 administrative villages, with a population of 246000, including an agricultural population of 178000. Huaian County is known as a "cultural county". In the Ming and Qing dynasties, Jinshi, Juren and students reached more than 400.
Airport In Huai'an County - Zhangjiakou Ningyuan Airport
Zhangjiakou Ningyuan Airport (Zhangjiakou Ningyuan Airport, IATA: ZQZ, ICAO: ZBZJ), located on Airport Road, Qiaodong District, Zhangjiakou City, Hebei Province, China, 9 kilometers away from the center of Qiaodong District, Zhangjiakou City, is a 4C-level domestic branch airport for military and civilian use   .
Zhangjiakou Ningyuan Airport was built in 1935 and was called Yulin Airport at that time; on May 9, 2010, the airport began military-civilian reconstruction project   ;On June 16, 2013, Zhangjiakou Ningyuan Airport officially opened civil aviation business   ; On August 3, 2020, the T2 terminal of Zhangjiakou Ningyuan Airport opened   .
As of February 2021, Zhangjiakou Ningyuan Airport has 2 terminals, of which the T1 terminal covers an area of ​​5,400 square meters and the T2 terminal covers an area of ​​13,900 square meters; the civil aviation station has 14 C-class seats; the runway is 3,000 square meters long. meters and a width of 45 meters; it can meet the needs of an annual passenger throughput of 1 million passengers and 10,700 aircraft takeoffs and landings      .
In 2021, Zhangjiakou Ningyuan Airport will handle a total of 464,638 passengers, a year-on-year decrease of 17.1%, ranking 132nd in the country; cargo and mail throughput will be 39.4 tons, a year-on-year decrease of 43.8%, ranking 196th in the country; A year-on-year decrease of 23.7%, ranking 167th in the country   .
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