I can't find the source, but a couple of years ago I saw a fascinating presentation from a genealogy & genotyping company showing that genetically more American

I can't find the source, but a couple of years ago I saw a fascinating presentation from a genealogy & genotyping company showing that genetically more American's had English heritage than German heritage. Combining the 'American' census category into the 'English' category pretty much removed the discrepancy...