The churches that those “gilded age protestants” attended are, today, by far the most leftist denominations in all of Christianity.
Yes, Episcopalian Charities aids immigrants. Yes, Lutheran Charities aids immigrants. Yes, Church World Services aids immigrants. Yes, all of these churches are pro-abortion, etc, and yes, the grandchildren of the know-nothing era are the ones in the pews at these churches today.
Guys wanna whine and complain about Catholics doing the same thing they’re also doing, it’s just hypocrisy. There are groups within Catholicism working to address these grievances to the church, while the Protestant response to their churchmates doing the same is to just schism, close their ears and poast about Catholics.