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Jul 4 9 tweets 4 min read Read on X
In his remarkable 1755 publication Observations Concerning the Increase of Mankind, Ben Franklin put on his demographer hat and foretold the rise of America to superpower status some 21 years before the signing of the Declaration of Independence. 🇺🇸 🇺🇸

🧵, please share!Image
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Franklin worked out demography from first principles.

He began with the observation that marriage drives population growth, and marriage in turn is driven by the ability of young men to support a family. He saw that when people marry early, they are able to have more kids. 2/9 Image
All the way back in 1755, Franklin knew of the problem of low urban birthrates.

He lamented how people in cities delayed marriage and embraced single living and how cities were a population sink, with more deaths than births. 3/9 Image
It is often said that demographics is destiny.

Franklin accurately foresaw how America would outrun Europe. Young men could easily buy land, get a homestead and marry earlier.

Americans were thus having twice as many children as Europeans, who married less often and later. 4/9 Image
Franklin wrote that through the force of higher birthrates, America would soon have more Englishmen than England.

By the power of compounding, with a doubling every generation, America would eclipse England as the great power, on land and at sea. 5/9 Image
An abundance of territory meant that young Americans would not be stuck in cheap labor jobs but could get a place of their own early on.

Because the continent was so big, this dynamic could play out for generation after generation, and it did! 6/9 Image
Amazingly, Franklin foretold the existence of high fertility sects like the Amish, who through a religious devotion to hard work, frugality and early marriage, would see "great increase"! 7/9 Image
Franklin also wrote of his dislike of slavery on multiple fronts.

He said overwork and poor treatment "broke the constitutions" of slaves. But also, he explained how slaveholding was bad for the character of the people that held them.

He later became a leading abolitionist. 8/9 Image
Seeing America's current birthrate woes, Founding Father, amateur demographer and pronatalist Ben Franklin would no doubt have some sage advice to offer on the occasion of America's 250th birthday:

(1) Marriage, and especially early marriage, are crucial for healthy fertility.
In turn, there need to be pathways to stable employment early on. If it takes too long to get established, people will marry late and have few children.

(2) Spread out on new land and embrace homeownership.
Franklin saw early on that when young people could get some land of their own, they would have large families and that crowding into cities was bad for birthrates.

(3) Embrace beliefs that teach marrying earlier and being "industrious and frugal"
Ben Franklin saw that certain beliefs lent themselves to higher fertility. Franklin would no doubt want to teach young people those values and would probably favor religious groups that hold those things. 9/9

Happy 250th! 🌎 🇺🇸

Follow @MoreBirths for solutions to our low fertility crisis! Subscribe if you can.Image

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More from @MoreBirths

Jul 3
HOW VANCOUVER ENDED UP WITH THE LOWEST FERTILITY IN THE WESTERN WORLD
Vancouver, Canada had a TFR of just around 0.7 in 2025. That's the lowest fertility of any major city in the West, and one of the lowest anywhere on Earth.

What forces lead to such low birthrates? 🧵. Image
The story starts with culture. Canada quite a bit less religious than the United States these days, and that is a big reason why Canada's TFR at 1.25 is much lower than the US (~1.6).

But within Canada, BC in general and Vancouver in particular are especially irreligious. 2/7 Image
The story continues with housing. Although Canada is big, the share of land that Canadians are allowed to build on is tiny, and that is especially true in British Columbia.

Some 95% of British Columbia is government-owned, leaving just 5% in private hands. 3/7 Image
Read 7 tweets
Jun 23
What is the impact of grandparents on fertility?

Three different recent studies found that having childcare help from grandparents leads people to have more children. 🧵. Image
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A 2023 study of China looked at how grandparents impacted the odds of going for a 2nd child.

Those who had childcare help from grandparents for their first child had a dramatically higher chance of going for a second. 2/4 Image
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A 2022 study in Spain looked at how fertility intentions change depending on whether grandparents help with childcare.

Women specifically were much more likely to want more children if the grandparents were helping out. 3/4 Image
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Read 5 tweets
Jun 21
Today we celebrate all fathers!

But most of all, we should recognize younger fathers, who are trying harder and doing more to be there for their families than any generation that came before them.

🧵, please share! Image
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All over the world, dads are spending far more time on childcare than ever before. Dads in the US today spend 4.5 times as much of their day on childcare as their own fathers did a generation ago. 2/6

(Chart by the brilliant @AzizSunderji.) Image
It's easy to say that dads aren't doing their fair share.

But it isn't true! When it comes to everything, paid work, housework and childcare, Dads today spend even more time on average than moms, nearly 60 hours a week! 3/6

(HT @RichardvReeves and Institute for Boys and Men.) Image
Read 6 tweets
May 31
A just-published paper introduces a new metric: the ratio of births observed (Bo) to births needed (Bn) to make up for deaths.

When Bo/Bn is below 1, a population faces natural decline.

With this lens, the dire situation of Europe and East Asia is thrown into stark relief. 🧵. Image
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Most often we rely on TFR, births per woman of childbearing age. But that ignores the age structure of a population.

Japan is an old country with few women of childbearing age, and deaths far outnumber births.

India is a young country, and births still greatly exceed deaths. 2/ Image
East Asia has less than half of the births needed to make up for deaths each year, indicating rapid demographic collapse. Conditions have gotten much worse since 2000, as these countries went from young to old.

Southern and Eastern Europe aren't much better in this regard. 3/6 Image
Read 6 tweets
May 27
Turkey's astonishing fertility collapse
Turkey's president Erdoğan made it his mission to revive birthrates. Instead, Turkish fertility has fallen faster than almost anywhere on Earth to just 1.42 in 2025 (just 1.2 outside of Kurdistan).
What happened, and what can we learn? 🧵.Image
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By every measure, Recep Tayyip Erdoğan has been a failure in the thing that mattered most to him, getting Turks to have more children.

Why? It doesn't help that Erdoğan is deeply unpopular with young people. 2/8
(Chart by @JesusFerna7026) Image
As demographer @lymanstoneky explains in a wonderful new article, the biggest direct cause of falling fertility is falling marriage.

When marriage falls, fertility plummets in a traditional country like Turkey where almost all childbearing is within wedlock. 3/8 Image
Read 8 tweets
May 22
India's new birth report just revealed a TFR of 1.88, a little below replacement.

But unlike most countries, 🇮🇳 does not have a crisis of low births. With its young population, India had 23 million births, 3x more than any other country.

A look at how India is different. 🧵! Image
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South Asia is the one region where marriage remains almost universal even as it has collapsed nearly everywhere else. Why? Arranged marriage.

In China, Korea and Japan, arranged marriage was common but became rare.

In India by contrast, arranged marriage remains the norm. 2/7 Image
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India's age profile for births tells a remarkable story. Indian births peak in the early 20s, and most women stop well before age 30.

India is a populous and crowded county, and so most Indian women simply choose to limit their fertility for that reason. 3/7 Image
Read 7 tweets

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