The following teaser is from an excellent article posted March 16, 2015 on the Deseret News website.
Celebrate St. Patrick’s Day with the invisible Irish, the Scotch-Irish. These are Scots who moved to Ireland four centuries ago, their offspring later immigrating to this country during the colonial period.
Once on these shores, the Scotch-Irish all but disappeared as a distinct group, dispersing and intermixing with other immigrant groups as they pushed westward and southward to the frontier.
Conversely, the Irish Catholic immigration was later, larger and more focused in urban areas, allowing them to retain a more distinct identity as Irish-Americans. But given that the American population was 15 percent Scotch-Irish at the time of the Revolution, there’s a good chance you may be a bit Scotch-Irish — and not even know it.