An Ethnic map of America. (Patreon)

This is a map of plurality largest ancestries in the USA. The map runs into issues with how most white and black Americans have plurality ancestries. For example, I have 6 different ancestries and that's not uncommon for Americans. Also, data is pretty scarce since census data normally isn't very representative since people will identify more with recent ancestries rather than their plurality largest ancestries. Census data will vary wildly decade to decade as people pick a different ancestry to identify with each time. 

Here are some interesting points

1)Most Hispanic-Americans are of majority or plurality European ancestry. Migration to the US pulls disproportionately from North Mexico, which has mostly European ancestry. It's kind of amusing that so many racists are talking about the de-whitening of America due to Mexican immigration. 

2)Black-American ancestry is pulled mostly from Angola and the Congo, in the case of the Carolinas and Nigeria in the case of Virginia. Black-American ancestry is so that drawing a dividing line between the two is quite difficult. The Western part of the Deep South likely has quite a bit of Virginian/Nigerian ancestry due to migration of slaves from Virginia to settle the cotton belt but I'm guessing not enough to displace the Angolan plurality. 

3) English Americans are the silent plurality in America. Everything points to English Americans being by far the largest group but this isn't widely thought about since most Englishmen came over to the New World in the 17th century, over 300 years ago, and Anglo-Saxon culture is the baseline in America and thus people primarily think of how their ancestry deviates from it.  This map likely also overestimates English blood, because in most regions that are majority white, English ancestry is most common but closely followed by German, Irish and Scottish. Part of the reason that English ancestry is so underestimated is that most English Americans also share German ancestry and choose to identify with that since it is a more recent migration.

4)There was a huge migration from Northern Ireland to the Appalachian mountains in the early 18th century. These people then migrated west and settled a huge region of the Center-South. This migration was forgotten in large part since the migrants spoke English as a native language and were Protestant but this migration has had a profound effect on American culture with things such as Country Music, Cowboy culture, whiskey etc... I'm also overstating Northern Ireland's influence in this migration since large portions also came from Southern Scotland and Northern England but Northern Ireland was likely the plurality everywhere. 

5)The railroad companies encouraged migration from Scandinavia in the late 19th century to settle the regions that were too inhospitable for Anglos. This worked and resulted in a Scandinavian diaspora in those regions.