[Verginius Rufus]

Western Scotland, Wales, Northern Ireland, and Northumbria. Why not Eastern Scotland?

Northern Ireland makes sense because a lot of people from western Scotland were settled there in the 1600s (the ancestors of today's Northern Irish Protestants and of America's Scots-Irish), but Northumbria was in northeastern England, so why not in the part of Scotland just to the north of there?

[Jan_Sobieski]

Western Scotland, Wales, Northern Ireland, and Northumbria. Why not Eastern Scotland?

Answer: Anglo-Saxon-Danes pushed the Romano Britons West