The United States Marine Corps is founded at Tun Tavern in Philadelphia by Samuel Nicholas.

The United States Marine Corps (USMC), also referred to as the United States Marines or simply the Marines, is the maritime land force service branch of the United States Department of Defense. It is responsible for conducting expeditionary and amphibious operations through combined arms, implementing its own infantry, artillery, aerial, and special operations forces. The U.S. Marine Corps is one of the six armed forces of the United States and one of the eight uniformed services of the United States.

The United States Marine Corps birthday is an American holiday celebrated every year on 10 November with a traditional ball and cake-cutting ceremony. On that day in 1775, the Continental Marines were established.

Tun Tavern was a tavern and brewery in Philadelphia, Pennsylvania, which was a founding or early meeting place for a number of notable groups. It is traditionally regarded as the site where what became the United States Marine Corps held its first recruitment drive during the American Revolution. It is also regarded as one of the "birthplaces of Masonic teachings in America".

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.