American Revolutionary War: The Second Continental Congress takes place in Philadelphia.

The Second Continental Congress (1775–1781) was the meetings of delegates from the Thirteen Colonies that united in support of the American Revolution and Revolutionary War, which established American independence from the British Empire. The Congress constituted a new federation that it first named the United Colonies of North America, and in 1776, renamed the United States of America. The Congress began convening in present-day Independence Hall in Philadelphia, on May 10, 1775, with representatives from 12 of the 13 colonies, following the Battles of Lexington and Concord, the first battles of the Revolutionary War, which were fought on April 19, 1775.

Philadelphia, colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania. It is the sixth-most populous city in the United States with a population of 1.6 million at the 2020 census, while the Philadelphia metropolitan area with 6.33 million residents is the nation's ninth-largest metropolitan area. Philadelphia is known for its culture, cuisine, and history, maintaining contemporary influence in business and industry, culture, sports, and music.

May 10 is the 130th day of the year in the Gregorian calendar; 235 days remain until the end of the year.