First, a lot of Scottish and Irish (Celtic) peoples did immigrate to the U.S. (obviously). Some of my ancestors came from Virginia to Kentucky, then finally to Southern Ohio. In Tennessee they sing Irish folk songs so old they have died out in Ireland itself. Second, I merely used Scottish as an example of a foreign English accent; I could have chosen others. I was only trying to illustrate that I struggle to understand native English speaking peoples with foreign accents sometimes, especially if they talk fast, which caused my amazement at the ability of Scandinavian peoples to understand each other's languages without having studied them (although, I suppose they do study them). During my family's one trip to Scotland, we understood everyone who regularly dealt with American tourists, but when my Dad ventured into a bar for some local flavor, they talked so quickly as to make it difficult (it could have been their slurred speech as well). Interestingly, they were watching the original Star Trek and talking about the Americans' awful accents.