There are other factors, of course, particularly the dysgenic effects of female education. One has to wonder what the point of educating women is supposed to be when the next generation of women are going to be considerably less intelligent because so few of the highly intelligent, highly educated manage to replace themselves.

But the sheer magnitude of the movement of peoples is the more significant factor. This is why the infrastructure in the USA is never going to return to the state it was in previous decades. The society simply isn't intelligent enough on average to maintain it any longer.

Remember, that's not just seven points, that's seven points PER GENERATION. Idiocracy is not just a movie about the dystopian future, it's a satire on the dystopian present. Welcome to Costco....