Pizza was brought to the United States with Italian immigrants in the late nineteenth century;[17] and first appeared in areas where Italian immigrants concentrated. The country's first pizzeria, Lombardi's, opened in 1905.[18] Following World War II, veterans returning from the Italian Campaign after being introduced to Italy's native cuisine proved a ready market for pizza in particular.[19] Since then pizza consumption has exploded in the U.S.[20] pizza chains such as Domino's, Pizza Hut, and Papa John's, pies from take and bake pizzerias and chilled and frozen from supermarkets, make pizza readily available nationwide.