There is a distinction between racism and xenophobia, no need to assign the same label to everything. i.e. the thing about Italians was cultural an educated immigrant from Northern Italy would have been considered as white as a French (not that there a significant number of those in the US) at least.

> It wasn’t that long ago that American racists debated whether Italians and even Irish were truly “white.” The definition of white had expanded considerably over the years. Eastern Europeans, Jews (of course), and Russians were also at times not “white.”

This idea is mostly a modern fabrication. Various more granular ethnic biases were of course present throughout American history, but those were never conflated with racial categories: in times and places where the white vs. black racial division was relevant, the ethnic groups you're referencing were always considered "white".

And the types of discrimination that people in white ethnic groups sometimes experienced was of of a type and of a degree vastly different from that experienced by black people. They're really two very distinct phenomena, and weren't evenly distributed throughout the US -- black people in the South had the legacy of slavery, Jim Crow segregation, and other horrifying things to deal with, whereas white immigrant communities in the Northeast or Midwest never experienced anything remotely similar.