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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.

The Daxing'anling region, located in the northwest of Heilongjiang Province, the northeast of Inner Mongolia Autonomous region and the northeast slope of the Daxinganling Mountains, is the northernmost prefecture-level administrative region in China; it belongs to the cold temperate continental monsoon climate It has jurisdiction over 4 municipal districts, 1 county-level city and 2 counties, with a jurisdiction area of 83000 square kilometers (Gagdachi District and Songling District under its jurisdiction belong to the Inner Mongolia Autonomous region, covering an area of 18200 square kilometers, accounting for 21.9% of the total area). The registered population is 439300. The Daxing'anling area is one of the national key state-owned forest areas and one of the main distribution areas of natural forests. it is also the only bright coniferous forest region in the cold temperate zone and the only remaining biological gene pool in the cold temperate zone in China. A large number of large and medium-sized gold deposits such as Mohe sand Baosyan gold deposit and Xinlin Tayuan lead-zinc deposit have been discovered in Delbugan and Daxinganling metallogenic belts.
Airport In Da Hinggan Ling Prefecture - Daxinganling Oroqen Airport
Da Hinggan Ling Oroqen Airport (English: Da Hinggan Ling Oroqen Airport, IATA: JGD, ICAO: ZYJD), formerly known as "Chigasian Airport (Chigasian Airport)", is located in Guangming Street, Jiagedaqi District, Daxinganling District, Heilongjiang Province, China [twenty four]  , 8 kilometers away from the urban area of ​​Jiagedaqi District in the north, is a 4C-level civil feeder airport   .
The predecessor of Oroqen Airport in Greater Khingan Mountains was a general-purpose airport, and it was the Jiagedaqi Aviation Forest Ranger Station; on September 6, 2009, the Jiagedaqi Aviation Forest Ranger Station began the reconstruction and expansion project; on June 18, 2012, the Jiagedaqi Gaxian The airport officially opened civil aviation business   ; On February 25, 2021, Jiageda Qigaxian Airport was officially renamed Daxinganling Oroqen Airport   .
According to the official website of the Heilongjiang Provincial Airport Management Group in 2021, the Daxinganling Oroqen Airport has a terminal building with a construction area of ​​4,870 square meters; there are 3 C-class seats on the civil aviation platform; there are 2 runways, of which the civil aviation runway is 2,300 meters long. 45 meters wide; the navigable runway is 500 meters long and 30 meters wide   .
In 2019, Jiageda Qigaxian Airport (now Daxinganling Oroqen Airport) completed a total of 182,783 passenger throughputs, a year-on-year increase of 17.1%, ranking 193rd in the country; cargo and mail throughput was 97.4 tons, a year-on-year increase of 32.4%, ranking first in the country. No. 190; 3,558 aircraft movements, an increase of 8.4% year-on-year, ranking No. 184 in the country   .
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