It’s important to understand that traditional Irish/Scotch/Celtic music took root in the mountains of Appalachia in the 19th century, and grew into what we now know as country music.
—> and grew into what we now know as country music. I like it too!
That was certainly one strain that blended into country.
The Country Music Hall of Fame has an amazing exhibit detailing each genre that eventually blended into today’s country music.