But here is the thing: It is no longer true that the divorce rate is rising, or that half of all marriages end in divorce. It has not been for some time. Even though social scientists have tried to debunk those myths, somehow the conventional wisdom has held.
Despite hand-wringing about the institution of marriage, marriages in this country are stronger today than they have been in a long time. The divorce rate peaked in the 1970s and early 1980s and has been declining for the three decades since.
About 70 percent of marriages that began in the 1990s reached their 15th anniversary (excluding those in which a spouse died), up from about 65 percent of those that began in the 1970s and 1980s. Those who married in the 2000s are so far divorcing at even lower rates. If current trends continue, nearly two-thirds of marriages will never involve a divorce, according to data from Justin Wolfers, a University of Michigan economist (who also contributes to The Upshot).
There are many reasons for the drop in divorce, including later marriages, birth control and the rise of so-called love marriages. These same forces have helped reduce the divorce rate in parts of Europe, too. Much of the trend has to do with changing gender roles — whom the feminist revolution helped and whom it left behind.
The marriage trends aren't entirely happy ones. They also happen to be a force behind rising economic and social inequality, because the decline in divorce is concentrated among people with college degrees. For the less educated, divorce rates are closer to those of the peak divorce years.
Of college-educated people who married in the early 2000s, only about 11 percent divorced by their seventh anniversary, the last year for which data is available. Among people without college degrees, 17 percent were divorced, according to Mr. Wolfers.
Working-class families often have more traditional notions about male breadwinners than do the college-educated — yet economic changes have left many of the men in these families struggling to find work. As a result, many wait to achieve a level of stability that never comes and thus never marry, while others split up during tough economic times.
Some of the decline in divorce clearly stems from the fact that fewer people are getting married — and some of the biggest declines in marriage have come among groups at risk of divorce. But it also seems to be the case that marriages have gotten more stable, as people are marrying later.
Ultimately, a long view is likely to show that the rapid rise in divorce during the 1970s and early 1980s was an anomaly. It occurred at the same time as a new feminist movement, which caused social and economic upheaval. Today, society has adapted, and the divorce rate has declined again.
In the 1950s and 1960s, marriage was about a breadwinner husband and a homemaker wife, who both needed the other's contributions to the household but didn't necessarily spend much time together. In the 1970s, all that changed.
Women entered the work force, many of their chores in the home became automated and they gained reproductive rights, as the economist Betsey Stevenson and Mr. Wolfers have argued in their academic work. As a result, marriage has evolved to its modern-day form, based on love and shared passions, and often two incomes and shared housekeeping duties.
The people who married soon before the feminist movement were caught in the upheaval. They had married someone who was a good match for the postwar culture but the wrong partner after times changed. Modern marriage is more stable because people are again marrying people suitable to the world in which we live.
The delay in marriage is part of the story, allowing people more time to understand what they want in a partner and to find one. The median age for marriage in 1890 was 26 for men and 22 for women. By the 1950s, it had dropped to 23 for men and 20 for women. In 2004, it climbed to 27 for men and 26 for women.
Overall, the marriage trends resemble those in many other areas of American life. For people on the wealthier side of the class divide, life is better than it used to be in many ways. For people on the other side, the situation is much more complicated.
And the effects could last for decades, as the children of stable marriages grow up with both the immediate benefits and the role models for successful future relationships — while at the same time, record numbers of children grow up in one-parent households.
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