It usually takes about 3-6 months to receive the information from USCIS. I received my dual citizenship through SF. I am on Facebook if you want to contact me to discuss.
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Dear Ms. Cacciolfi,
Thank you for posting your request on History Hub!
In a preliminary search, we did not locate evidence that Francesco Cacciolfi became a naturalized citizen of the United States. If he did not become a U.S. citizen, we suggest that you submit a request for Certification of Non-Existence of a Record of Naturalization from USCIS. For instructions for that process, please review https://www.uscis.gov/history-and-genealogy/genealogy/requesting-help/genealogy-frequently-asked-questions (see About Further Research).
Please note that the National Archives does not have the authority to issue a certification of non-existence of a record of naturalization but can only issue a negative search letter. Negative results for a search of National Archives holdings only indicates that a naturalization record is not in the possession of the National Archives. It does not indicate that the record is non-existent.
We hope this is helpful.
[Information provided by Elizabeth Burnes, Subject Matter Expert]
Was he a railroad foreman and did he go by the name Francis. lived at 8 Grove St. Montague, Mass. This 1940 census shows this person as NA, meaning naturalized. https://www.familysearch.org/ark:/61903/1:1:K4X5-RKP
Hope this helps