Hi Eric–
To the best of my knowledge, Benton Mackaye’s original vision for the Appalachain Trail was that the northern terminus was to be Mt. Washington, New Hampshire. The southern terminus would be Mt. Mitchell, North Carolina.
The original southern terminus was actually designated as Mount Oglethorpe, Georgia. Due to vandalism and other reasons, it was re-located to Springer. Springer was thought to be a remote location, less accessible to those who might cause destruction.
If you have not read “Walking with Spring” by Earl Shaffer, I recommend it. It is the first solo thru-hike, back in 1948. It has a tremendous amount of history about the early trail.
Hope this helps…
fraser fir