"...Negroid, Caucasoid and Mongoloid..."
Holy shit man, we already suspected you were promoting some racist bullshit, but you didn't have to lean into it harder.
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Scientific skepticism or rational skepticism, sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence.
Do not confuse this with General Skepticism, Philosophical Skepticism, or Denialism.
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"A wise man proportions his belief to the evidence." -David Hume
"...Negroid, Caucasoid and Mongoloid..."
Holy shit man, we already suspected you were promoting some racist bullshit, but you didn't have to lean into it harder.
Those terms were seriously used in academic circles around 2000 and even more recently as well. There's a weird whole complex theory on the outdated idea. https://en.m.wikipedia.org/wiki/Mongoloid
Did some Europeans get to the northern americas pre-1490s?
Yes.
But only by like.... A few hundred years, only in small areas, and only for a short amount of time.
Not "prehistory" and certainly not en-masse.
And what happened to them? They weren't around after the 1500s, certainly not when the westward expansion began.
Like... You have to believe so much other bullshit just to accept a small amount of it.