The promise was not kept and they were shot in the place named Aria corta situated behind the town building,[7] After the unification of Italy, Pietraroja has experiment a strong emigration, especially towards the United States. After World War II, the flow directed to northern and central Italy and to Europe (Switzerland, Germany and England). The opening of a stone quarry in the place named "Canale", moreover closed subsequently, of a clay quarry in the place "Saure" no more drawn out for the cheap quality and of coloured marble quarry in the place "Pesco Rosito", open but never operating, did not reduce emigration.