The Fight to Revive Europe’s Shrinking Rural Areas
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AI Summary. Spain's immigrant and second-generation population totals at least 12m — roughly 25% of the total population — with nearly 40% of children under 5 either immigrants or born to immigrant parents.
Nicholas Eberstadt American Enterprise InstituteCore argument: Spain's first- and second-generation immigrant population totals at least 12 million—roughly 24% of the country's 49 million people—making mass migration a defining structural feature of Spanish society.
Spain’s first and second-generation immigrant population comprises at least 12 million—almost 9.5 million immigrants and over 2.5 million of their descendants. [Spain’s population was ~49mm at the starts of 2025.] Over a third of Spain’s under 40 population are now first or second generation immigrants. And our numbers suggest that nearly two-fifths of Spain’s children under 5 are the children of immigrants, or immigrants themselves. Since our method misses second-generation immigrants not living with their parents, the absolute and relative size of Spain’s mass migration population is likely somewhat greater than we estimate.AI Summary. Spain's population growth between 2000 and 2025 was almost entirely (98%) driven by immigration, as natural population increase (births minus deaths) was negligible; since deaths have exceeded births since 2015, all future population growth depends entirely on continued immigration.
Nicholas Eberstadt American Enterprise InstituteCore argument: Spain’s natural population balance turned negative in 2015, making immigration the sole driver of any future population growth.
Without immigration, Spain’s population would have stagnated in the first quarter of the 21st century. According to official Spanish data, births exceeded deaths by barely 200,000 for the 2000-2025 period (2025 numbers still provisional)—or less than one half of 1% of Spain’s 2000 population. Thanks to its robust immigration inflows, however, Spain registered more population growth than any other EU country between 2000 and 2025. Virtually all (98%) of Spain’s population growth was due to immigration during those years. And since deaths have exceeded births in Spain since 2015, any future growth would have to come entirely from additional immigration.AI Summary. Israel is the only wealthy democracy where fertility has risen over the past generation, reaching a total fertility rate of 3.0, driven entirely by Jewish fertility growth; secular Jewish Israelis average nearly 2 births per woman—2x the rate of secular Jewish Americans.
Nicholas Eberstadt and Patrick Norrick American Enterprise InstituteAI Summary. Global fertility has fallen below replacement level, meaning population will peak at roughly 9 billion around 2056 and then decline, driven by large existing generations masking the underlying shortfall in births.
Jesús Fernández-Villaverde and Patrick Norrick University of PennsylvaniaCore argument: Global fertility has fallen below replacement level as of 2026, ending humanity’s ability to sustain long-run population stability without a reversal in trends.
In Table A1 we compare the World Population Prospects (WPP) estimates of births in 2022-2023 with the official numbers reported by several countries. [A2 shows the full sample with the deviations.] As of 2026, humanity is likely to be below the replacement fertility level: we are having fewer births than we need to keep population constant in the long run. This astonishing fact does not mean that population has stopped growing. Because of momentum effects (the large cohorts of women born two or three decades ago are having their children now, and their own parents have not died yet), world population will keep growing for another 30 years or so. But unless trends change, it will peak at roughly 9 billion around 2056 and then start falling, first slowly, then fast.AI Summary. Japan's birth count has fallen below levels recorded over 150 years ago, with 2024 births at roughly 686,000 — less than 25% of the 1947 peak and lower than figures from the earliest available records.
Nicholas Eberstadt American Enterprise InstituteCore argument: Japan’s 686,000 births in 2024 represent barely one-quarter of the 1947 peak of 2.7 million and fall below the country’s 1873 baseline, erasing more than 150 years of demographic growth.
The admirable Human Mortality Database, pioneered by researchers at Berkeley and Rostock, Germany, offers careful reconstructions of such historical birth numbers for dozens of developed countries. We can use their figures for our comparisons. Start with Japan. By 2024, the Japanese birth level was barely a quarter of its peak in 1947, 77 years earlier (686,000 vs. over 2.7 million). But Japan’s 2024 level was also significantly lower than the corresponding total for 1873—over 150 years earlier, at the dawn of the Meiji era, when Japan first started gathering such numbers. And remember—fertility levels around the world are still falling.AI Summary. Children under 18 in large U.S. cities have declined 6x faster than the national rate, with children under 5 falling 15% in big cities versus 7% nationwide, even in cities with overall population growth.
Rachel Louise Ensign and Paul Overberg Wall Street JournalCore argument: Children under 18 in large U.S. cities declined 6% over the past decade, six times the 1% national rate, signaling a structural demographic shift away from urban cores.
The number of children under 18 living in big U.S. cities is down 6% in the past decade, the Journal found, compared with a 1% decline nationwide. The drop is especially stark among families with little kids: The number of children under age 5 in big cities fell 15%, compared with a drop of 7% nationwide. Even cities that are gaining population are losing children. In all, the number of children declined in about two-thirds of the 38 U.S. cities with more than 500,000 residents. The Journal analyzed census data from 2015 through 2024, the most recent data available.