Stromboli is closely associated with Pennsylvania, particularly Philadelphia, where it is believed to have originated. While its exact origins are disputed, it is widely believed to have been created by Italian-American immigrants in the city during the 1950s. Stromboli is similar to a calzone but is typically rolled instead of folded and filled with ingredients such as Italian meats, cheeses, and vegetables. Today, stromboli has become popular beyond Pennsylvania and can be found in many pizzerias and Italian restaurants across the United States.