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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.

Luxi County is a county under the jurisdiction of Honghe Hani and Yi Autonomous Prefecture, Yunnan Province. It is located in the southeast of Yunnan Province and in the north of Honghe Hani and Yi Autonomous Prefecture. Its geographical coordinates are 103 °30 degrees north longitude, 103 °30 degrees longitude, 39 °46 #39;, 24 °15 degrees north latitudes, bordering Shizong County in the northeast, facing Qiubei County in the southeast, and adjoining Maile County in the southwest. The northwest is connected with Lunan County and Luliang County. 166km from the provincial capital Kunming, 178km from the state capital Mengzi, 176km from Qujing, 235km from Wenshan, 182km from Xingyi, Guizhou province, with a total area of 1674 square kilometers. Luxi County is located in the upper reaches of the Pearl River Basin and in the east.
Travel Notes In luxicountry
Luxi, Yunnan: Dream Alu Ancient Cave, Secret Chengzi Ancient Village
preamble there is nothing you can't step on The roof of my house is your garden nothing can't be given The walls of my house are the walls of your
Exploring the Secrets of Eastern Yunnan in Yunnan——Traveling Edition
Colorful Yunnan is not only the romantic Dali, but also Lijiang, the capital of romantic encounters. In Yunnan, there are still many mysterious places
Hundreds of families are connected to each other in this Chengzi village in Yunnan. The roof of your house and my courtyard are the original scenery of my hometown.
Chengzi Ancient Village, located in Yongning Township, Luxi County, was built on the mountain, and I couldn't help but be amazed when I saw it at firs