This is really evident when you look at the genetic data from places like Ancestry.com and 23andMe. The states with highest percentage British&#x2F;Irish are all in the South:<p><a href="http:&#x2F;&#x2F;www.sciencedirect.com&#x2F;science&#x2F;article&#x2F;pii&#x2F;S0002929714004765#fig3" rel="nofollow">http:&#x2F;&#x2F;www.sciencedirect.com&#x2F;science&#x2F;article&#x2F;pii&#x2F;S0002929714...</a><p><a href="http:&#x2F;&#x2F;blogs.ancestry.com&#x2F;ancestry&#x2F;2014&#x2F;04&#x2F;04&#x2F;a-genetic-census-of-america&#x2F;" rel="nofollow">http:&#x2F;&#x2F;blogs.ancestry.com&#x2F;ancestry&#x2F;2014&#x2F;04&#x2F;04&#x2F;a-genetic-cens...</a><p><a href="http:&#x2F;&#x2F;blog.23andme.com&#x2F;wp-content&#x2F;uploads&#x2F;2014&#x2F;10&#x2F;Bryc_ASHG2014_textboxes.pdf" rel="nofollow">http:&#x2F;&#x2F;blog.23andme.com&#x2F;wp-content&#x2F;uploads&#x2F;2014&#x2F;10&#x2F;Bryc_ASHG...</a>