I just never once learned that Michiganders made up any of the settlements in Appalachia. My class taught us that the settlements near the northernmost parts of Appalachia tended to be German and slowly transitioning into your Amish people. The Scots-Irish (not pure Irish, sorry about that mix-up as it's been a couple years since the class) came in from Boston and New York, went through the areas settled by those Germans, and moved down the Appalachian Mountains to get into the areas of the Virginias, Kentucky, Tennessee, and North Carolina. I can't recall why they went immediately south-southwest, whether it was money, religion, or other forces (like not being welcomed into the area by those who had already settled).