Death certificate for that time period would be state records (a few large cities, such as NYC kept their own records). If you give us their names, approximate birth years, and state or city where they died, we could help you look for the records or tell you where you might find them.
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The Federal Government does not ordinarily create or maintain birth, death, marriage, divorce, or probate records. Such records are made and kept by state and local governments rather than the National Archives. Considering the time period of the death certificate that you’re trying to find, it could very well be in possession of the State Archive that the death occurred in. For a listing of State Archives, please visit the list available at this link:
We also suggest searching substitute record sources such as death records, church records, and newspaper records that may uncover more information about your ancestor. For more information on conducting genealogical research within our records, please visit the following link:
We hope this information is helpful and best of luck with your research!