In the Wikipedia article Haplogroup R1b (Y-DNA) http://en.wikipedia.org/wiki/Haplogroup_R1b_(Y-DNA) The following statement is found: # M222 is also found as a substantial proportion of the population of Scotland which may indicate substantial settlement from northern Ireland or at least links to it.[33][57] Those areas settled by large numbers of Irish and Scottish emigrants such as North America have a substantial percentage of M222.[33] # I checked the references given and did not find anything specifically directed to the USA. My question is: Was there differential migration of M222 to the USA? i.e. Are the proportions of M222 amongst descendants of Irish and Scottish migrants in the USA any different from those found in Ireland and Scotland? Yair Davidiy Jerusalem Israel