Nixon's people were from Ireland, and not Catholic, but not imported by William of Orange from Scotland either. He didn't consider himself Scots-Irish. In any event, the bulk of them had lived in Ireland (Antrim in particular), for a couple of hundred years before they started coming to America to "conquer" the frontier (they were considered ideal for that task, including in particular, being able to "handle" hostile Native Americans).
Yes, they were quite used to committing genocide and taking land that did not belong to them....
The real term is Scotch Irish. They are pretty proud to celebrate the link in many parts of Northern Ireland, they even have some tourist sites to visit mediocre and bad Presidents' homesteads. This is now probably merely for $$$ but did have some past efficacy.
As with any/all? of the hypenated _____-American names, the meaning is really useless.
