N!geria. Average income per year $4,248 USD. TFR per woman: 5.4.
USA. Average income per year $61,000 USD. TFR per woman: 1.9.
You don't need a new car at 16 and a $120k lazy-river resort LAC education in college to survive and multiply.
Primer on survival of the fittest
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You do know that the fertility rate in countries with low development is high because people need to create offspring to secure intergenerational transfers back to them later in life due to a lack of social security systems, right? Second demographic transition and all, does that ring a bell?