Steve Sailer has an interesting post about the birth rate as related to parents IQ. The tend is that the lower a woman's IQ, the more children she has. We have a lot of immigrants coming in from the south that have lower average IQ than Americans. All of this does not bode well for the future. By mid-century the average IQ in America may fall by up to four points. I see different numbers for the average IQ in Texas now, but it seems to be lower by from two to four points as compared to when I was young. There are more Mexicans in Texas now than the total population of the state when I was born.