"Throughout the eighteenth and nineteenth centuries, a steady stream of Scots migrated to Ulster and eventually onward across the Atlantic to resettle in the United States. Many of these Scots-Irish immigrants made their way into the mountains of the southern Appalachian region."

I've a lot of respect for Doug Orr, but my information is that a substantial number of the 'Scots-Irish' were settled in Ulster from England, especially but not exclusively the North. Although Cecil Sharp had no business calling his collection 'English Songs from the Southern Appalachians' - since a lot of the common Appalachian ballads ('Earl Brand', 'Young Hunting', etc) have an almost exclusively Scots history - others like 'Cruel Ship's Carpenter' ('Pretty Polly') might well have arrived from England. Some of the family names seem English too - and I believe that the Hicks and Sands family actually claimed English ancestry.

One of these days I'd like to go through Sharp and other Appalachian collections and find out where the musical and textual affinities of those songs really lie!