Prove that you have a right to dual citizenship. You will have to prove your lineage by ordering birth and death certificates for your parents, grandparents and great-grandparents, as long as they emigrated from Italy before 1961. These can be obtained by contacting the Department of Vital Records in the American state where your relative was born or died or by contacting the Registrar of Vital Statistic in the Home Office in Italy.
Contact the Italian consulate that serves your state to get the required paperwork. You'll have to call it and request a mailed copy or visit in person and get a hard copy of the documents. A list of Italian consulates and the states they serve can be found in the resources section.
Fill out the required paperwork and return it to the consulate, along with copies of all required birth, marriage and death certificates. You may also need copies of naturalization certificates and green cards.
Sign a form saying that you never renounced your Italian citizenship. You must also have living family members attest to this for themselves and that deceased family members, too, did not renounce citizenship.
Schedule an appointment with the consulate to discuss your application. It can take months to get approved for an Italian passport, but once it's done you're a citizen for the rest of your life, as are your children under 18 and your spouse, if they so choose.
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