Dear Charlie,
I strongly disagree with your comparison. The question today, is one of ignorance. Americans (as a whole) know very little about what goes on all over the globe. Even in countries that we have committed billions of dollars in financial aid plus military expenses. Mostly, it is because of the diminishing role of the main stream media. We are out of touch with the massive amount of global suffering there is today. Americans are not looking at immigrants as sub-human or a threat to american culture.
The comparison here is a bit like the political sentiment around the Immigration Act of 1924. The descendants of the earlier immigrants are once again thinking that they represent some ideal of a Americanism, even though they vigorously state that there is no such concept. To protect this homogeneity, they raise objections to various immigrant groups. Probably, because they realize that their own decendants have less interest in American culture, than first generation Americans.
The issue with Jewish was best displayed by a frum author in a major right wing paper. He was describing Roosevelt’s WWII borders policies as misguided only in that should have made exceptions based on the Holocaust. This is an expose on Liberal Jews trying to portray themselves as right wing Conservatives. Being children or grandchildren of immigrants, having grown up around major cities, living in the Northeast, and a major stress on Torah education, they are completely out of touch with what life means for the average American. Trump supporters are not racist, or trying to round up anyone. they are completely oblivious to what it means to work as hard as can just to achieve a decent life.