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Jun 1 9 tweets 6 min read Read on X
Resisting Birthrate Decline Through Culture: How one part of Japan bucks the trend
Japan's woes are well known, its population long in decline, it's economy stagnating.
Yet one prefecture continues to grow, not through policy but through a pronatal culture.
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For more than forty years, Okinawa has had far higher fertility than any other prefecture (Stone, 2024).

But Okinawa's fertility used to be lower than the 🇯🇵 average (map by @yz7sha).

How did Okinawa manage to develop a pronatal culture, so different from the rest of Japan? 2/9 Image
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The story starts after World War II.

Unlike the United States or most countries that participated in the war, Japan never had a postwar baby boom, and a 2016 paper explains why.

Facing defeat and a loss of resources, Japan embarked on a crash program of population control. 3/9 Image
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Yet Okinawa and neighboring islands like Tokunoshima escaped the antinatal messaging experienced by the rest of postwar Japan. How? Because they were under temporary American rule!

As another 2016 paper explains,
"Okinawa's postwar history regarding fertility and family deviated from the path of Japan as a nation state. The demographic transition, and particularly fertility transition in Okinawa, started under not the Japanese but the U.S. military administration." 4/9Image
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Okinawa has a share of large families (4 or more children) that is much higher today than any other part of Japan.

Large families are a key indicator of pro-natal beliefs. In the rich world most people don't have large families unless they believe in children! 5/9

Map: @yz7sha Image
A 2019 essay in the South China Morning Post goes further explaining Okinawan pronatal culture.

Belief in the importance of having children "is so great it outweighs the fact that Okinawa’s welfare policies for children are often less generous than in other regions." 6/9 Image
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The article goes on to emphasize the greater role of fathers in Okinawa, going against national norms.

This is significant. Nobel laureate Claudia Goldin cited the disproportionate burdens of working mothers in East Asia as a key cause of lower birthrates. 7/9 Image
Finally, demographer Lyman Stone points out that women in Okinawa marry and have children earlier than in the rest of Japan, giving them more time to have more kids than elsewhere.

This in turn is due to less emphasis on long educations as compared to the rest of Japan. 8/9 Image
Okinawa's uniquely pronatal culture goes a long way to explain how it manages healthy birthrates, in spite of family policies are less generous than in many other places in Japan.

What few realize is that Okinawa's time under American rule, in an era when the rest of Japanese culture was being transformed by population control efforts, allowed pronatal values to endure on the island even as they were being pushed out everywhere else. 9/9Image

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More from @MoreBirths

Apr 27
A wonderful paper by Spears et al. showed that population reduction would have almost no impact on climate change.
Why? The main reason is that a baby born today will emit much less carbon than someone born a generation ago, and their children will emit even less carbon. 🧵 Image
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Most previous forecasts of how population would impact climate assumed that carbon emissions would continue at the same rate indefinitely.
But per-capita carbon consumption has been falling sharply and will fall even faster in the future as renewable energy takes over. 2/4 Image
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Meanwhile, because of population momentum, total population takes decades to change meaningfully.

By the time depopulation kicks in, per capita carbon emissions will be much lower than they are today, and so the climate impacts of population by then will be much lower. 3/4 Image
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Read 4 tweets
Feb 23
Knowing birthrates are driven by a stack of factors lets us figure out what is happening in each country and what its 👶 bottlenecks are.
Things like beliefs about children, marriage, housing conditions, religiosity, work culture and more all have a big impact.
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In Spain (TFR 1.12), big hurdles include a huge fraction of young people living with their parents (driven by relatively poor employment for young people), the high share of housing that is small apartments, and declining faith among the young. 2/13
Poland (TFR 1.11) has a culture that is obsessive about work, with the longest work hours in Europe. After the fall of Communism, almost 70% of young Poles regularly practiced religion; today, less than 25% do. Housing is small and crowded. 3/13
Read 13 tweets
Feb 16
Fertile No More!
For more than a hundred years, Ireland was both the most religious and the most fertile country in Europe.
But in recent years, Ireland experienced rapid secularization, and its fertility fell to just 1.47 in 2024.
What happened to 🇮🇪, and what comes next?
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First, a bit of history.
By the 1800s, Ireland had become almost entirely reliant on just one crop. Potato blight struck in 1845, and soon famine and mass migration cut the Irish population from 8 million down to 4. Ireland's population is still well below its 1845 peak. 2/7 Image
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Ireland gained independence in 1921, and Catholicism was central to Irish identity, partly in defiance of protestant England.
For most of the 20th century, 🇮🇪 was deeply religious, with church attendance above 90%.
The Irish idealized large families, and fertility was high! 3/7 Image
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Read 7 tweets
Feb 9
Getting old without ever getting rich
Thailand, with a TFR of just 0.95 in 2024, never even had a chance to get rich before its birthrate collapsed.
A look at how over-zealous family planning combined with cultural factors to put 🇹🇭 on a demographic downward spiral.
New 🧵!Image
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Unlike its neighbors Korea and Taiwan, Thailand with a per-capita GDP of just $7000 never got to get rich before facing ultra-low birthrates.
For Thailand, the biggest cause was family planning run amok.
(Below, a wedding dress in Thailand made of entirely of condoms!) 2/9 Image
The father of Thai birth control is Mechai Viravaidya, an enthusiastic family planner who led round after round of family planning efforts. As its birthrates plunged, Thailand was lauded as a huge success.

But then these efforts blew far past the mark. When Thailand hosted the International Conference on Family Planning in 2022, its fertility was already down to 1.01 and still dropping fast. With January 2025 data already reported, Thai births were down another 8.4% from January 2024.

Here is Viravaidya posing proudly with a tree made out of... Guess what? 3/9Image
Read 9 tweets
Jan 24
The fastest fertility collapse in the world
In 2024 Chile recorded a fertility rate of just 0.88 births per woman, a drop of 23% in a year and 51% since 2015. No country has seen fertility fall as fast.
A look at how social changes have overwhelmed 🇨🇱 and threaten its future.
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In recent years, Chile has been wracked with protest. In 2018, there were some 151 feminist protests across the country.
Then from 2019 to 2021, these mixed with large youth-led anti-establishment protests, which turned violent and often resulted in brutal police responses. 2/7 Image
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In the aftermath of the protests and the subsequent crackdown, many women have sworn off of childbearing, and anti-natal beliefs have taken hold.
This has analogues to South Korea's gender tension and its notorious 4B movement (women rejecting dating, sex, marriage & kids). 3/7 Image
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Read 7 tweets
Jan 8
South Dakota has the highest fertility of any US state and is the only state near replacement fertility.
Why is the birthrate so high in South Dakota and what lessons are there for the rest of America and the world?
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First is religiosity. Some 50% of South Dakotans rate religion as very important in their lives, well above the US average of around 37%.
Higher religiosity is associated with higher fertility both in the US and worldwide. 2/10 Image
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Second is social values. South Dakota is one of the most conservative states in America, and conservatism is strongly associated with higher fertility in the US, both for states and at the county level. 3/10 Image
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Read 10 tweets

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