I am Scottish, and I have a bit of a different impression of the Scottish/Irish in the US South. Especially the Irish.
Ancestors left Ireland to escape persecution and famine. Scots left Scotland because Jacobites, and later the highland clearances.
And there is the indentured servitude stuff. And that has a strange mixup with slavery. Where some folk say their ancestors worked out of slavery and all that.
And Irish were persecuted in early America. As were Catholics in general. I remember reading something in the Federalist papers that Irish were not to be included in the 2nd amendment. They were banned from having guns at some point.
So they headed south ? Something like that anyway. Because they could sell themselves into indentured servitude. But even if they done that, they were not at the bottom.
If I am rambling rubbish, feel free to say.