Left leaning Americans are driving the US birth decline

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Left-leaning Americans are driving the U.S. birth decline, new study finds

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A recent study published in Scientific Reports suggests that political beliefs are increasingly linked to the number of children Americans choose to have. The findings indicate that while conservative individuals tend to maintain birth rates near historical averages, left-leaning individuals are having significantly fewer children. This demographic trend provides evidence that differing birth rates are a main driver of recent fertility declines in the United States.

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Political attitudes are often thought of as simple opinions. However, research suggests they are relatively stable traits shaped by both social upbringing and genetics. Because parents tend to pass their political orientations down to their children, differences in family size among political groups can influence the ideological balance of a population over time.

Martin Fieder and Susanne Huber wanted to understand how this relationship has evolved. “As evolutionary biologists, we are interested in why left- and right-wing political orientations did evolve and whether they are subject to natural selection through differences in fertility,” explained Fieder, an associate professor of evolutionary demography at the University of Vienna. “Earlier studies showed that political orientation is heritable and that fertility patterns differ across the political spectrum.”

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The authors also looked at how race interacted with these demographic trends. When analyzing White and Black Americans separately, they found that the widening fertility gap between the left and the right was primarily driven by White Americans. Among White participants, the reproductive advantage for conservatives grew substantially in the more recent birth cohorts.

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For Black Americans, the researchers did not find a similar political divergence. While overall fertility among Black Americans also declined over time, birth rates remained relatively similar across the political spectrum. The authors suggest this might happen because ideological labels like liberal and conservative are often understood differently across various racial and cultural groups.

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