Finding the migrant’s place of birth is the real difficulty of the research.
There is not a civil status central archive in Italy but thousands of town halls’ and parishes’ small archives.
Migrants did not come from big cities, they often came from small cities instead; the objective is reached only through a deep knowledge of those territories.
Your Italian ancestors’ last names are studied; a geographical area is identified and we go to look for the documents in the archives themselves verifying step by step the validity of our hypothesis.