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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.

Yugan County, which belongs to Shangrao City, Jiangxi Province, is located in the northeast of Jiangxi Province, bordering Wannian County in the east, Nanchang and Jinxian County in the west, Yujiang County and Dongxiang County in the south, Poyang County and Duchang County in the north. The land area is 2331 square kilometers, and the landforms are mainly low hills and lakeside plains, with high topography in the southeast and low in the northwest, slowly tilting from the hills in the southeast to the northwest, and then to the lakeside plain. The east-west tributaries of the Xinjiang River, which runs through the whole territory, flows into Poyang Lake, which is basically composed of "four rivers, three mountains and two fields, one road and one manor". In 2016, the total registered population of Yugan County was 1.083 million. In 2016, Yugan County achieved a GDP of 13.22 billion yuan. In 2017, Yu Gan was successively awarded the National Advanced County in Letters and visits, the National Advanced County in Real Estate work, and the 2017 most Green County in China.
Airport In YuGan County - Shangrao Sanqingshan Airport
Shangrao Sanqingshan Airport (Shangrao Sanqingshan Airport, IATA: SQD, ICAO: ZSSR), located in Houmentang at the junction of Zunqiao Township, Zaotou Town, Guangxin District, Shangrao City, Jiangxi Province, and Maojialing, Xinzhou District, Shangrao City, from the center of Shangrao With a straight-line distance of 8 kilometers, it is a 4C-level feeder airport and the seventh civil airport in Jiangxi Province.
Shangrao Sanqingshan Airport was built on July 8, 2012 and officially opened to navigation on May 28, 2017.
According to comprehensive information in May 2017, Shangrao Sanqingshan Airport covers an area of ​​2,243 acres, with a total investment of about 800 million yuan. The runway is 2,400 meters long and 45 meters wide, with 6 seats.  
In 2019, the passenger throughput of Shangrao Sanqingshan Airport was 500,156; the cargo and mail throughput was 153.8 tons; the number of takeoffs and landings was 5,982; ranking 144th, 181st, and 154th in China respectively.  
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