Yes, "today" is indeed a long time ago.
Just out of curiosity(and ignoring the fact that you're using debunked junk science from a eugenics proponent), just what is a significantly lower IQ? Do you know how big the gap needs to be to be able to tell any difference between two individuals?
By the way: Christian immigrants are also highly over-represented in crime. Buddhists too. Probably more.
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