How to find if may grandfather who died in Queens NY) was naturalized at his death in January 1, 1918

mv.... is this for dual citizenship?  If so, you will need to have a certified copy if no naturalization was found.... see: https://www.uscis.gov/g-1041a  who will do a search on the naturalization status of your ancestor.  If this is for personal research, and he resided in NYC, then you might find: https://www.italiangen.org/databases/search/ useful.

mv.... is this for dual citizenship?  If so, you will need to have a certified copy if no naturalization was found.... see: https://www.uscis.gov/g-1041a  who will do a search on the naturalization status of your ancestor.  If this is for personal research, and he resided in NYC, then you might find: https://www.italiangen.org/databases/search/ useful.

Joel,   I am needing this for dual citizenship. Thank you so much, this was very helpful.

Kind regards

Mary 

I do have a question.  If my grandfather was not naturalized or did not petition of naturalization before his death, does that show on his death certificate and if not where do I find that.  Thank you again Mary   

These are the items on a death certificate at that time and location:

Place of Death, Full Name, Sex, Color or Race, Marital Status, Date of Birth, Age, Occupation, Birthplace, How long in US, How long in NYC, Name of Father, Birthplace of Father, Maiden Name of Mother, Birthplace of Mother, Date of Death, Certification, Place and Date of Burial, Undertaker's Name and Address.

You can see his death certificate for free at the NYC Historical Vital Records site here:

https://a860-historicalvitalrecords.nyc.gov/

Would he be listed in the 1910 US Census? That should indicate whether he was naturalized or not.