Yes, they are native to the USA.

They aren't native american of course. That's a silly dishonest argument based on wordplay.

So why are they not "native Americans" but the people referenced in your quote are "native Brits"?

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So using a term as an ethnonym for historically British ethnic people is racist?

If so, is it racist to assert or assume that ethnic Europeans exist?

Social justice fundamentalism asserts that there are favored (“oppressed”) groups, and disfavored (“oppressor”) groups.

True believers have created a largely arbitrary grouping called “white people”, assigning it the “oppressor” label.

If a favored group’s nation were flooded by “white people”, that would be seen as an emergent situation requiring remedy; the opposite is what we’re seeing play out in societies like Britain, and is Not a Problem. I’m committing an act of violence by even describing it in this way.

How or when a disfavored group is restored to neutral or favored status is undefined; one would presumably have to consult a head priest of the movement for an answer (and I wouldn’t expect any coherence or clarity).