Just as an aside, I feel like "Scots-Irish" is a fairly uniquely American phrase which you don't really hear in Scotland or Ireland. There are a couple of possible interpretations and always I wonder which is meant:

1. Ulster-Scots, i.e. the Scottish people who moved into northern part of Ireland (now all of Northern Ireland plus a couple of counties in Ireland)

2. Some Irish and some Scottish, i.e. they have ancestors from both places and want a word to describe this

3. Generally celtic, i.e. they know it's Ireland or Scotland or maybe both and want to cover their bases

Neither is particularly harmful, but I kind of wish some people understood that #1 is a distinct thing