It depends on the state. New Englanders are overwhelmingly English, Scottish, and Irish. Appalachians are mostly English and Ulster Scot, Southerners bias English and Scottish. West of there you a lot more German overall and then in the North you get a lot of Scandinavians. Obviously Utah is a strong English exclave.
Attached obviously doesn't tell you the full story because of the self-identification, lack of population density scale, and the fact that it splits up mixed groups into singular categories, but it generally lines up with my impressions.
But I think the euromutt meme is a bit overstated, the White American stock is essentially a few different Germanic groups (German, English, Dutch, and Scandinavians), the British Islanders (English, Scots, Irish, and Ulster Scots), and then Italians (bias towards Sicilians and Southern Italians in general, because more North Italians stayed in Italy).