One of the unspoken truths about race in this country is that the average IQ for Blacks is about 15 points lower than for Whites. (The standard Gaussian curve does not fit perfectly, of course, but it is a good enough fit for about 95% of both groups.)
Current studies suggest somewhere between 50% and 70% heritability for IQ — meaning that about 50-70% of one’s IQ depends on the IQ of your parents. There is, naturally, some environmental factors — such as whether your parents read to you as a child, and your home life in general.
There are structural problem for Blacks in our society today. Minimum Wage laws price many Black youths out of the labor market, so they can never reach that bottom rung of the economic ladder and start their climb. The democrat-run inner-city schools are a joke. Our criminal justice system is not race-blind. (The jury should never know the name, sex, or race of the accused. Justice really should be blind.) These government-imposed problems prevent Black men from attaining the ability to support a family. But the God-given biological drive to reproduce is still there — so they do. But the government will take away benefits from a woman who marries the father of her children. So the government makes the “spread your seed far and wide” strategy better for many Blacks (from a propagation of one’s genes perspective) than a “keep your eggs in one nest and guard it vigilantly” strategy. This, of course, perpetuates some of the problems of the Black community.
So what if polygamy were legal?
If polygamy were legal, many Black women might choose to marry a successful (intelligent) Black man who already has a wife or two. Than man could be having children with younger wives well into his 60′s and 70′s. Not only would this propagate his better genes, but those children would grow up in a better household than they would as the children of less intelligent men in single-parent households.
Furthermore, the less-intelligent men would not be reproducing with those women. Win-win.
Over time, we might see that IQ gap close considerably.