When were the last significant numbers of Americans of solely English heritage born?

[TheReckoning]

This is a bit of a random question, but looking at the family background of many of the presidents, it seems a vast majority of them had at least non-English British Isles descent (Scots-Irish, Scottish, and Welsh). It seems the last president of solely English ancestry was Benjamin Harrison, born in 1833. I can imagine a vast majority of the people born in the English colonies were originally of solely English descent, but when did this population fade into basically nothing, and even the most generic “white Americans” would be all but guaranteed to have some non-English ancestry?

[Samof94]

This is a bit of a random question, but looking at the family background of many of the presidents, it seems a vast majority of them had at least non-English British Isles descent (Scots-Irish, Scottish, and Welsh). It seems the last president of solely English ancestry was Benjamin Harrison, born in 1833. I can imagine a vast majority of the people born in the English colonies were originally of solely English descent, but when did this population fade into basically nothing, and even the most generic “white Americans” would be all but guaranteed to have some non-English ancestry?

This isn't Australia with its "Anglo-Celtic" culture where that number would be rather late in the 20th century. For America,  the last generation that way would maybe be some of the Atlantic Southern states before the Civil War(tidewater ones esp.).

[TheReckoning]

This is a bit of a random question, but looking at the family background of many of the presidents, it seems a vast majority of them had at least non-English British Isles descent (Scots-Irish, Scottish, and Welsh). It seems the last president of solely English ancestry was Benjamin Harrison, born in 1833. I can imagine a vast majority of the people born in the English colonies were originally of solely English descent, but when did this population fade into basically nothing, and even the most generic “white Americans” would be all but guaranteed to have some non-English ancestry?

This isn't Australia with its "Anglo-Celtic" culture where that number would be rather late in the 20th century. For America,  the last generation that way would maybe be some of the Atlantic Southern states before the Civil War(tidewater ones esp.).

What about isolated towns in Appalachia/Upper New England?

[Roll Roons]

Probably the early 1840s. That's when there was mass German and Irish immigration followed by the post-Civil War waves from Italy and Eastern Europe.

[Beet]

Uhh, today? About 25 million Americans identified as "English alone" in the 2020 Census:

https://en.wikipedia.org/wiki/English_Americans

It seems the German/Irish waves weren't as strong in upper New England and South, especially Appalachia.

[Bismarck]

This is a bit of a random question, but looking at the family background of many of the presidents, it seems a vast majority of them had at least non-English British Isles descent (Scots-Irish, Scottish, and Welsh). It seems the last president of solely English ancestry was Benjamin Harrison, born in 1833. I can imagine a vast majority of the people born in the English colonies were originally of solely English descent, but when did this population fade into basically nothing, and even the most generic “white Americans” would be all but guaranteed to have some non-English ancestry?

This isn't Australia with its "Anglo-Celtic" culture where that number would be rather late in the 20th century. For America,  the last generation that way would maybe be some of the Atlantic Southern states before the Civil War(tidewater ones esp.).

What about isolated towns in Appalachia/Upper New England?

Most Appalachian folks have mixed English and Scottish Ancestry. If he had asked about purely British (and not specifically English) that’s a more interesting question.

[patzer]

Surely there must still be a decent number of Mormons of solely English ancestry considering most of the first Mormon settlers in the Utah area were.