World Map: Population Density, Fertility, GDP, And Policies To Control Or Boost Fertility To sustain themselves, many nations adopt policies to raise, lower, or maintain their population levels. And while a country's gross domestic product can often help predict its stance, that's not always the case.

Map: Population Density, Global Fertility, And GDP

To sustain themselves, many nations adopt policies to raise, lower, or maintain their population levels. And while a country's gross domestic product may often predict its stance, that's not always the case. Roll your mouse over the countries below to learn more about them:

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