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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.

Aohan Banner, Chifeng City, resident Xinhui Town, is located at the northern foot of Nulur Hushan vein, the southern edge of Horqin Sandy Land, Naiman Banner of Tongliao City in the east, Jianping County of Chaoyang City in the west, Beipiao City and Chaoyang County in the south, and Wengniute Banner in Chifeng City in the north. Aohan, originally the name of the Mongolian tribe, was translated as "Boss" in Mongolian. Aohan is a famous cultural relic county in China. More than 4000 ancient sites of different periods are distributed on an area of 8300 square kilometers. Among them, four kinds of prehistoric cultures such as Xiaohexi culture, Xinglongwa culture, Zhaobaogou culture and Xiaoheyan culture were found and named in Aohan. Aohan is also a famous agricultural county. In Gulubanhao Township, there is Hongshan Reservoir, the largest reservoir in Northeast China, which is the most important water conservancy project in the West Liao River Basin. The aquatic products produced by Hongshan Reservoir are sold to the north.
Airport In Aohan - Chifeng Yulong Airport
Chifeng Yulong Airport (Chifeng Yulong Airport, IATA: CIF, ICAO: ZBCF), located in Tuchengzi Village, Niujiayingzi Town, Karaqin Banner, Chifeng City, Inner Mongolia Autonomous Region, China, about 15 kilometers northeast from the center of Chifeng, is a 4C-level military and civilian Shared use of domestic regional airports   .
On September 20, 1958, Chifeng Xijiao Airport officially opened to traffic   ; On August 25, 2006, the Chifeng Yulong Airport project started construction; on March 20, 2008, Chifeng Yulong Airport was opened, and Chifeng Xijiao Airport was permanently closed; in 2016, Chifeng Yulong Airport's station floor reconstruction and expansion project was opened   .
As of August 2022, the T2 terminal of Chifeng Yulong Airport has an area of ​​31,534.89 square meters, with 9 boarding bridges; 1 Class B seat, 16 Class C seats and 1 isolation stand on the civil aviation platform ; The runway is 2,800 meters long and 50 meters wide, which can meet the annual passenger throughput of 2.78 million passengers.      .
In 2021, Chifeng Yulong Airport will handle 1,421,971 passengers, a year-on-year increase of 10.2%, ranking 77th in the country; cargo and mail throughput will be 1,184.7 tons, a year-on-year decrease of 47.5%, ranking 115th in the country; aircraft take-offs and landings will be 13,727, a year-on-year increase 7.8%, ranking 112th in the country [twenty three]  .
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