And there you have it folks, the experiment's control from laboratory to the North.
It's probably true in the UK as well, with alleged "IQ" standings out the window.
Culture and environment have a huge impact on IQ. For instance, a thread from yesterday mentioned the Romanian orphans who were discovered after the fall of communism, who were barely functioning. They spent their lives in a crib with little to no human interaction. I have heard from colleagues working with Africans that in general, because of high infant mortality, mothers do not place nearly the value on their infants as we do in the west. A child gains in value only as it ages, as the investment into it has been greater and has a likelier chance of “paying off” as a productive adult family member. I would imagine that an infancy strapped to a mother’s back as she works and generally ignored other than for the most basic maintenance would have an impact on brain development.
A bit of a minefield here for anyone. There are differences in Canada between the old fashioned immigrant of the 1950/1960 era. When I immigrated in 1955, I was told with others, commit a crime and get at least 6 months jail- back you go to where you came from. (What a joke these days).
I lived near an all black community in Nova Scotia called Africville. Years of neglect and hard scrabble from these descendants of slaves saw little crime. The British intercepted slave ships and landed them at Preston, Nova Scotia. No problem at all to anyone white. I never heard of any nasty incidents there.
Covered up by the Canadian media, are the grim statistics of black crime in Toronto. Mainly more recent arrivals from the Caribbean. A police official was stomped on (verbally) for giving out the statistics. The media hardly dare mention colour, except in all points bulletins.
I do not live in Toronto. Way up north, but we have the well behaved influx of black students at two educational facilities. It is mind boggling to me why things are the way they are. Immigrants in my day sometimes had a heck of a time at first. Either went back or stuck with it.
Once more a ramble by me.