Collection coverage tables show the places and time periods of original records published. Check the coverage table for the collections you searched which did not include your ancestor. Gaps in the online collection may require searches in other records or original birth records at an archive.
destroyed'''<br>[http://user.xmission.com/~jsvare/record_coverage/US_counties_records_loss.html United States Counties With Records Loss] shows which counties and when the loss happened. Zoom in to the state and click on a county marked in red to see date details.