Many documents our ancestors left behind were in the counties they lived in.  Birth, Marriage and Death records.  Deeds, Wills and other Probate records.

But when were they first recorded? When was the county created?  What were the parent counties?

The Ancestry Wiki has the answer for all U.S. counties. In the Wiki search box type state name County Resources :

Once you get to the page, scroll down the page and you’ll find a table on the County Resources page that summarizes basic information that will help guide your research in that county.

Great information so you don’t waste time looking for documents that don’t exist.