This census data had understated the number of Italians in the city area and this mistake seems to be confirmed by a series of subsequent events. Indeed, following the Treaty of Rapallo, the Italians of Dalmatia could opt for the acquisition of Italian citizenship instead of the Yugoslavian one, while maintaining residence: despite a violent campaign of intimidation on the part of Yugoslavia, over 900 families of Italian speaking "Spalatini" had exercised the option to be Italians. Furthermore, in 1927 was carried out a Census of Italians living outside Italy: in Spalato and surrounding area were counted 3,337 Italian citizens.