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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.

Yongshan County, which belongs to Zhaotong City, is located in the northeast of Yunnan Province. Xiluodu Hydropower Station is the second largest hydropower station in China and the third largest hydropower station in the world. In 1727, the governor of Yungui Ertai suppressed Pingmitie, and the county was named "Yongshan" by the imperial court, which meant to obey discipline forever. In 2014, Yongshan County has jurisdiction over 6 towns and 9 townships, with 4 neighborhood committees and 133 administrative villages. The county government is stationed in Xiluodu Town, 680 kilometers southwest from the provincial capital Kunming and 200 kilometers south from Zhaotong Municipal Government. Located at the northwest edge of Zhongshan Mountain in northeastern Yunnan, the plateau is broken because it is cut by the Jinsha River and its tributaries. The highest elevation is 3199.5 meters, and the lowest elevation is 340 meters. The main rivers are Jinsha River, Sabina River, Damotan River, Jingdi River, Longchong River and so on. It belongs to the humid climate of the subtropics.
Travel Guides In Yongshan County
Travel Notes In Yongshan County
[Sleeping Beauty] on Qipanshan:
A million-year-old beauty sleeps worryingly,Hope Lang has not seen each other for a long time,May God bestow upon you,Weaver Girl Cowherd has infinite
Daxing Wild Papaya--Childhood Memories
In Banchanggou, Luji Village, Daxing Town, Yongshan County, Yunnan Province, there is a kind of vine-like shrub called papaya tree, which grows on roc
Yongshan Huanghua The Seven Heroes of the People's Liberation Army Yunlanzui Tour
Today, the country is rich and the people are strong, the environment is beautiful, and the people live and work in peace and contentment. On the occ
Yongshan Makou, a quiet and mysterious tourist paradise hidden by the Jinsha River
Located in the southwest of Yongshan County, Makou Town, between the two giant hydropower stations of Xiluodu and Baihetan, Xiaotian is in the majesti
Travel Asks In Yongshan County
Travel Asks In Yongshan County