physiological not social

The problems of North American aboriginals (Nai's) can be summed up in one word, unskilled. To achieve wealth ,on average, a population here must have skills. However skills are mostly correlated to IQ. Tis better ,skill wise, to have a high IQ and come from a broken home than a low IQ and a good home in this society. It is difficult to get a low IQ'ed group to pass tests which are often not designed for a low IQ group. It is similar to asking a group short legged people to  out run a group of long legged people. Why conjectured low IQ'ed? Diet. A group of people who have evolved on a mainly omega 3 meaty diet up to as little as 500 years ago, some less, are now switched to a mainly processed carbohydrate diet. The result is certainly diabetes but why IQ? -http://www.nature.com/pr/journal/v63/n3/full/pr200860a.html#tbl1- shows a variation in verbal IQ with a slight change in diet to a group who has eaten far less a variation than the Nai's. Certainly there are other issues, brought on by despicable, misled and idiotic actions but I conjecture this as the biggest.