As the first screenshot from the National Archives shows, there are Archives in every state of the United States. There comes a time in the life and learning of genealogists when they realize the vast number of records that they have never looked at or attempted to research. This is when the genealogist visits a state archive.
Here in Maryland, for example, as we have been digitizing records, I am just now beginning to see that nearly every person who lived in this state in the 1800s could be found in the records we have seen so far. The number of people in the probate records is staggering. I may have mentioned before that the volunteers here in the Archives will digitize somewhere between 1.5 and 2 million records this year and the project is expected to continue for 6 to 8 more years or so.
Many of the state archives have substantial online, searchable databases. However, entering the world of the archives can be a daunting and complicated process. Many of the archives have access restrictions that include registering and complying with strict use procedures. Here is an example from a video about the Maryland State Archives.
Planning a visit to the Maryland State Archives
Some of the state archives are closely associated with a state library and/or a state historical society. Genealogically important records may be located in any one or all of these additional repositories. Perhaps it is time that you began this expanded aspect of your genealogical research efforts.