I don't think it's proper to assume that because one group (in this case western civilization in general) chooses to limit their population growth, that all groups regardless of their cultural ideas will do the same
What Adam Smith said.
The Mormons are the exception in the world. The exception does not prove the rule . Family size decreases as income rises for the most part. And it isn't just a Western thing. Look at Japan for instance. They don't have a One Child Policy, yet only want a few children. Why? Because of the high incomes in Japan the value of the peoples' time is great, and therefore they wish to spend less time on child rearing.
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