also didn't downvote, but clearly there are confounding variables (fertility also correlates with poverty, for example) There is a common argument that X socia

also didn't downvote, but clearly there are confounding variables (fertility also correlates with poverty, for example) There is a common argument that X social group has a lot of children, thus they'll become a greater proportion of the population over time (typically applied to developing countries, immigrants etc). These arguments are flawed because humans don't really work this way, and adopt k vs r selection depending on environment.