If the term "ancient roads" actually appears in the historical documents related to this (not sure if it does or not), it could say more about Vermont's Francophone past than anything else. In French it would be appropriate to call these "ancient roads" (anciennes rues) in the sense that they're "old" or "former" roads, like how ancién regime just means "former regime."
Same! Reminds me of the old adage: "Americans need to learn a hundred years is not a long time just like Europeans need to learn a hundred miles is not a long distance."
I have family in Switzerland who, IIRC, are living in a ~700 year old farm house that doesn't qualify as historic because it's not old enough (too many other similarly old farm houses for it to be considered rare enough to protect).
Meanwhile, my parents considered an "historic" house in Ohio from around 1900.
Edit: For some reason, I was hoping for a catalog of American Indian trails. Otherwise, pretty interesting article.