Newberry Atlas of Historical County Boundaries has been under construction and unavailable. I received an announcement today that the interactive map was once again online and functional.
As you click through the dates listed on the left, you can see the boundary changes applied to the map. As genealogists, identifying the exact location of an advantage in an ancestor's life is crucial to identifying where records may have been kept and where they are located today. When you hover over any one of the counties above, you will see the information in the text box change to correspond to the County.
The Newberry Atlas of Historical County Boundaries should be on every genealogists most used program list.