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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.

"Delinha" means "Golden World" in Mongolian. Delingha City, founded in 1988, is the capital of Haixi Mongolian-Tibetan Autonomous Prefecture of Qinghai Province. It is the center of politics, education, science and technology, and culture of the whole prefecture. It is also the center of the eastern economic zone of Hercynian. Delingha City has jurisdiction over three streets, three towns and one township with a total area of 27700 square kilometers, with an elevation of 2980 meters above sea level in the urban area. by 2012, it has a population of nearly 100000. There are 19 ethnic groups, including Mongolia, Tibet, Hui, Sala, Tu and Han, with Mongolians as the main ethnic minorities. There are 16 kinds of mineral resources and 65 mineral deposits found in Delingha City, of which the proven limestone reserves are more than 700 million tons, which is of high utilization value. Gahai Lake, 30 kilometers south of the city, is rich in natural Artemia resources. two
Travel Notes In Delhi city
Self-driving in Haixi, Qinghai, meeting the most beautiful Emerald Lake
Goodbye Qinghai, it is amazing I have been to Qinghai twice, and I am used to the altitude of Qinghai, but when the third time came, I still drank rho
August 2018 Qinghai trip (2)
On the second day of the trip to Qinghai (12th), today's destination is Delingha, where we will stay at Haixi Hotel in Delingha. The journey is about
2021 Qing (Qinghai) Gan (Gansu) Grand Ring Road
I started planning in 2019. In May 21, I negotiated with my family and friends to confirm the itinerary. Then I started to book air tickets and hotels
I'm in Delingha tonight
At first, I didn’t think about going to Delingha. Later, because of the holiday, I decided to go to Delingha because the nearest city to go to Tibet i