Some societies, such as the chinese, did recognize their own self invasive nature and attempted at regulating with the one child policy.
Other groups, such as caucasians from Europe and north America, are in need of the opposite policy if they want their group to survive, since 1.3 child per familly is below the renewal rate.
Then you have the muslims, who are clearly an invasive species with 5-8 children per familly, and conscioulsy use it as a weapon to take control over the societies they invade.
Overall I see the trend that the poor have more children, while the rich tend to he self limiting, and this has an impact on how our societies evolve.
There you have the big generalizations
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