It might be easier for someone to help you if you provided a little more information on your ancestor that you might have.
Do you have the names of his parents? Spouse? children? All would help in identifying the correct Robert Williams.
Try the search tool on familysearch.org - free online genealogy site, maybe you will recognize the correct Robert.
See the link below for many Robert Williams - b. 1875 NC.
https://familysearch.org/search/records/index#count=20&query=%2Bgivenname%3Arobert~%20%2Bsurname%3Awilliams~%20%2Bbirth_place%3ANC~%20%2Bbirth_year%3A1870-1879~
