It used to be that way, but IQ has actually been dropping in Europe for quite some time. In France and the UK it's a drop of about 4 IQ points per decade, which

It used to be that way, but IQ has actually been dropping in Europe for quite some time. In France and the UK it's a drop of about 4 IQ points per decade, which is a bit of a crisis (some scores can be found compiled here: https://www.researchgate.net/publication/309330272_The_negative_Flynn_Effect_A_systematic_literature_review https://www.researchgate.net/publication/309330272_The_negat...). There's a claim that the reversal of the Flynn effect is environmental (https://www.pnas.org/doi/10.1073/pnas.1718793115 https://www.pnas.org/doi/10.1073/pnas.1718793115), by two Norwegian researchers, but they've argued in a way which is obviously fallacious-- they basically said that environmental effects explain the drop in Norway, but the drop in Norway is relatively low, around 1 IQ point per decade (although that is of course incredibly bad) and the argue that this is the case for the other countries as well, but that doesn't follow since the drops in the countries they do not even consider are so much larger. In fact, they could have made another argument, for example that the drops in the UK and France can't be environmental because those effects in Norway can only be made to account for one 1 IQ point per decade.