Understanding the naturalization requirement some times a little bit hard for people that are not familiar with the citizenship laws and regulations.
The application for Italian citizenship can not be accepted unless the applicant is able to prove that his/her Italian ancestor that was born in Italy has not been naturalized in the US before his/her birth or before the birth of the first intermediate ascendant that was born in USA.
Documents that are need to prove such condition are the following: the official certificate of naturalization, and declaration of Intention/Petition for naturalization (when applicable).
In some cases the applicant is already in possession his/her ancestor’s original certificate of naturalization (which includes the word “ORIGINAL”). In this case the applicant simply needs to procure the related Declaration of Intention and Petition for Naturalization (when applicable) from the National Archives, State Archives or Local Court. These documents must bear the original seal of the issuing authority as well as date and the signature of clerk, which give the documents legal authority.
If the Certificate of Naturalization is not available the applicant must provide the following: official statement (in original, not photocopy, and with the Office Seal) from the US Immigration and Naturalization Service (USCIS) in Washington D.C. (425 I Street North West, 2nd Floor, ULLICO Bldg., Washington, DC 20536) AND FROM THE County Court in which the ancestor used to reside, stating the number of the Certificate of Naturalization and the date of the naturalization. The statement must show the Italian ancestor’s full name (and any other aliases or variants he/she went by on any official documents), place of birth and date of birth, date of the naturalization, certificate number;
If the ancestor never became a US citizen, the applicant will have to show his/her Italian passport and Alien Registration Card.
If the Research shows NO RECORD the applicant is required to obtain a certificate of “non existence of records” and to double check with the National Archives (NARA) requesting a full search under the ancestor’s name and aliases and variants, possible dates of birth which he/she may have declared in the course of his/her life. If the research shows no results again, NARA will issue a “no record” statement.