By Nicholas Eberstadt
The United States’ global preeminence owes a great deal to demographics. After the collapse and fragmenting of the Soviet Union, the United States became the world’s third most populous country, behind the giants China and India. By comparison to other developed countries, the United States maintained unusually high levels of fertility and immigration—a phenomenon I termed “American demographic exceptionalism” in these pages in 2019. Since the end of the Cold War, the overall American population and its number of working-age people (between the ages of 20 and 64) have grown more rapidly than those of other developed countries—and faster, too, than those of rivals China and Russia. Growing working-age populations boost national productivity in economies run by governments that can successfully develop and tap human resources. For modern welfare states, the slower aging of the population forestalls some of the fiscal burdens built into current arrangements.
To the extent that crude demographic trends matter in world affairs, they have been running to the United States’ advantage for some time. But big changes are underway. The initial returns from the U.S. 2020 census and the reports about last year’s birth totals offered sobering news: with the slowdown of population growth
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