R-L21 Haplogroup and the Scots-Irish

 

Above is a map showing the location of the R-L21 Haplogroup.  R-L21 Haplogroup and the growing number of downstream (more recent in chronology) is the haplogroup of the majority of the Scots-Irish.  Historically it represents the 'Western Atlantic Celtic' population, which includes the Insular Celts, both Gaelic and Cumbric.   In layman's language, this population has it origins in the indigenous Celtic tribes of Britain and Ireland.  Within the Scots-Irish population this includes the native Cumbric Celtic tribes of what we now call the Scottish Lowlands, and the Gaelic population.  This tells us the majority of the people in the New World that identify as 'Scots-Irish' are the descendants of the indigenous Celts of the British Isles and Ireland.  (map is from the Eupedia website)