The first St. Patrick's Day Parade in 1771 was held in the city of Philadelphia, marking over 250 years of celebration. The parade, which also commemorates 250 years in Irish contributions to the United States, came years before "The Declaration of Independence" and the Continental Congress. The Irish have contributed heavily to the city's industries and helped build many of its landmark buildings. The celebrations have evolved into themes of religious, patrioticism, and a celebration of Irish culture.