What Went Wrong –– How Families Disappeared

Sex, marriage, and children used to come as a complete package. You got all three or you got none. Biology made it that way. If you had sex, pregnancy followed. If pregnancy happened outside marriage, social consequences were severe enough that marriage typically followed too. And children needed two parents' resources to survive, so the whole thing held together through a combination of hormones, economics, and shame. Between roughly 1960 and 1990, every link in that chain was severed. The pill arrived in 1960. No-fault divorce spread through state legislatures in the 1970s. Women entered the workforce. Welfare programs expanded. Each change made sense on its own terms. Taken together, they disassembled something that had been load-bearing for the entire species. What replaced the old package was a market. A matching market where you had to find a partner, negotiate what the relationship would look like, and accept that either person could walk away at any time. Some people turned out to be very good at this market. A lot of people turned out to be terrible at it. And at the population level, something that had been almost universal, forming a family, started becoming uncommon. This is part 3 of the What Went Wrong series Part 1: We Forgot We Were Animals Part 2: The Thirty Months That Broke Everything US fertility sits at about 1.62 children per woman as of 2023. Replacement is 2.1. Marriage rates have been cut roughly in half since 1970. Among young adults, the share who have never married has climbed past 30%. The thing that humans have done since before we were fully human, pair up and have kids, is now failing at scale in every developed country on earth. I want to understand why. Understanding mechanisms is the only way to address them. Moralizing about it does nothing. We are pair-bonding animals I don't mean that as a metaphor or as some kind of poetic shorthand. Unlike most mammals, humans developed stable partnerships between males and females, held together by specific adaptations: hormones like oxytocin and vasopressin that make you want to stay with someone, jealousy that keeps you watching for threats to the bond, and the fact that both parents invest in offspring who take years to become self-sufficient. Our children are helpless for so long that a single parent was, for most of our evolutionary history, basically a death sentence for the kid. Two parents splitting the work was the arrangement that natural selection landed on. But these partnerships always needed something outside of themselves to hold them together. People needed economic reasons to stay paired up. Laws and customs that made it hard to walk away from your commitments. Social pressure that pushed sexual energy toward marriage rather than letting it go wherever it wanted. And on top of all that, they needed meaning, stories about what family was for, that made all the sacrifice feel like it was worth it. Nobody sat down at a round table and designed any of this on purpose. It evolved through selection for thousands of years. The arrangements that produced grandchildren who survived are the ones that spread, and everything else just disappeared. Imperfect, obviously. It constrained people, created genuine injustices. But it also kept the species going. Modern life destroyed the scaffolding piece by piece. Each was removed for defensible reasons. More autonomy, less gender-based injustice, adapting to how the economy was changing, more "rights". The problem is that scaffolding does things even when it constrains you. Take it away, and what it was holding up doesn't simply stay there floating. Quick definition before we go further: replacement fertility means the birth rate needed to keep a population stable without immigration. That's 2.1 children per woman. The US is at 1.62 and still dropping. Family formation collapsed because the scaffolding was removed from every direction at once Economically, marriage became optional. Legally, commitment became reversible. Technologically, sex got separated from reproduction. And culturally, family went from being something you just did to a lifestyle option you could take or leave. Each of these fed into the others. What emerged was a mating market where fewer people pair up and even fewer of the people who pair up bother having kids. It all starts with economics (wages went flat for non-college men, housing costs exploded, credential requirements stretched education into the late twenties). That feeds into time pressure (both partners have to work, every milestone gets pushed back by years). Which erodes trust (when half of marriages end in divorce, getting married starts to feel like a bet you'll probably lose). Which creates mating market dysfunction (people sorting by class, women's preference for marrying up slamming into the reality that there are fewer men to marry up to, dating apps turning partner selection into a scrolling past time). And all of that produces fertili