The right to divorce — no-fault, fault, and the global map

Martin Luther's De Captivitate Babylonica (1520) argued that marriage was not a sacrament and could be dissolved on biblical grounds. John Calvin's Genevan reforms permitted divorce for adultery or desertion. Henry VIII's English break with Rome was, at the personal level, a divorce dispute. The Protestant theological reframing of marriage as a civil contract rather than an indissoluble sacrament opened the conceptual space for legal divorce. The Catholic position, formalized at Trent, was that marriage between baptized persons consummated was absolutely indissoluble except by death — a position the Church still holds and that produces the asymmetry between Catholic and Protestant European divorce regimes for the next four centuries.

The French Revolution introduced divorce in 1792 on broad grounds including mutual incompatibility. The Napoleonic Code of 1804 retained divorce on fault grounds and by mutual consent. The Bourbon Restoration abolished divorce in 1816 at Church urging. France re-legalized divorce in 1884 (the Naquet law) on fault grounds only. Mutual consent returned in 1975. The French trajectory illustrates the political volatility of divorce law and the close coupling between regime change and family law reform — each French political transition reopened the question.

England permitted divorce only by private act of Parliament from 1670 to 1857, making it effectively available only to wealthy men. The Matrimonial Causes Act of 1857 created judicial divorce on adultery grounds, with the husband requiring only adultery and the wife requiring adultery plus aggravating circumstances — a gender asymmetry not corrected until 1923. The Divorce Reform Act of 1969 introduced irretrievable breakdown as the sole ground, demonstrated by one of five facts including adultery, behavior, desertion, two-year separation with consent, or five-year separation without consent. The Divorce, Dissolution and Separation Act 2020 introduced true no-fault divorce by removing the fact requirement, effective April 2022. England arrived at unilateral no-fault more than fifty years after California.

Herma Hill Kay was a primary architect of the California Family Law Act of 1969. The Governor's Commission, chaired by Aidan Gough, took testimony from divorce lawyers, judges, social workers, and clergy. The consistent message was that the existing system was corrupt — couples staged adultery, hired witnesses, and perjured themselves routinely. The Commission's report recommended elimination of fault grounds entirely. The Reagan administration accepted the recommendation and signed the bill in 1969, effective 1970. Kay's later reflection was that the reformers underestimated how thoroughly fault grounds had functioned as bargaining leverage and how the loss of that leverage would affect outcomes for the financially weaker spouse.

Lenore Weitzman's 1985 book The Divorce Revolution claimed that women's post-divorce standard of living fell 73 percent while men's rose 42 percent. The claim became the most-cited statistic in family law and informed federal welfare policy. Subsequent reanalysis by Richard Peterson (1996) found Weitzman's data did not support those magnitudes — the actual figures were more like a 27 percent decline for women and 10 percent increase for men. Weitzman acknowledged the error. The corrected magnitudes are still substantial and the qualitative finding stands: no-fault divorce coincided with a deterioration in women's relative economic position. The methodological controversy taught family law a lasting lesson about over-reliance on a single empirical claim.

Margaret Brinig and Douglas Allen examined who files for divorce under unilateral no-fault regimes. Their 2000 analysis found that women filed approximately two-thirds of divorces in the US. They argued this was inconsistent with the standard narrative that no-fault primarily benefited men seeking to abandon wives. Their interpretation was that women, who typically retained physical custody of children, filed because the post-divorce package (custody plus child support plus property division) was on average favorable to them despite the loss of marital income. The analysis sparked extensive debate about whether the post-divorce package adequately compensated for the loss of bargaining leverage or whether it represented an exit from genuinely worse marital conditions.

Mavis Hetherington's longitudinal studies of divorcing families, summarized in For Better or for Worse (2002), provided the most comprehensive empirical picture of divorce's consequences. Hetherington found that about 25 percent of children of divorce showed lasting adjustment problems compared to 10 percent of children in intact families — meaningful but smaller than commonly assumed. Most children adjusted within two to three years of the divorce. The strongest predictors of bad outcomes were continued parental conflict and economic disruption, both of which were partly endogenous to the divorce process itself. Hetherington's data shaped custody and divorce-mediation reforms by showing that minimizing conflict mattered more than preventing divorce.

Louisiana enacted covenant marriage in 1997, followed by Arizona in 1998 and Arkansas in 2001. Covenant marriage is an opt-in marriage track that requires premarital counseling and limits divorce grounds to fault-based ones or extended separation. Uptake has been extremely low — under 2 percent of marriages in covenant-marriage states. The institution exists as a kind of demonstration project for restrictive divorce, but its low adoption rate suggests that even couples who endorse covenant marriage in principle prefer to retain the easy-exit option in practice. The covenant marriage experiment is one of the most informative natural experiments in family law: given an explicit choice between covenant and standard marriage, couples overwhelmingly choose standard.

Italy's 1970 divorce law (the Fortuna-Baslini law) was challenged by referendum in 1974, with 59 percent voting to retain divorce. The referendum was a watershed moment in Italian secularization. Spain's 1981 divorce law was a key element of the post-Franco democratic transition. Ireland's 1986 referendum on divorce failed by 63-37; the 1995 referendum passed by 50.3-49.7, the narrowest margin imaginable. Malta's 2011 referendum passed by 53-47. The pattern is one of slow, contested, often referendum-driven legalization, with Catholic-majority publics dividing closely and the secularizing force gradually winning. Annulment usage spikes in the period before legalization and declines after, suggesting annulment was operating as a workaround.

Tunisia's Code of Personal Status (1956) abolished talaq and required judicial divorce on equal grounds for husband and wife. Morocco's Mudawana reform (2004) similarly required judicial supervision. Egypt's 2000 khula law permitted women unilateral judicial divorce on return of dower. India's 2019 abolition of instant triple talaq came after decades of activism by Muslim women. The general direction is toward judicial supervision and gender equalization, but the pace and extent vary enormously. Saudi Arabia and Iran retain more classical structures, though Saudi Arabia's 2019 reforms permitted women to obtain certain forms of divorce without male guardian approval. The Islamic divorce map is mid-transition; the next twenty years will likely see substantial further reform.

The Philippines is the only sovereign state besides Vatican City that prohibits divorce. The Family Code permits annulment on limited grounds (psychological incapacity, lack of parental consent for younger spouses, fraud, force) and legal separation, but not dissolution that permits remarriage. Muslim Filipinos have access to divorce under the Code of Muslim Personal Laws. Bills to legalize civil divorce have been introduced repeatedly and have passed the House of Representatives at least once (2018) but stalled in the Senate. The Catholic Bishops Conference of the Philippines has been the primary organized opposition. The Philippine situation is the closest analog to pre-1996 Ireland and may resolve similarly in the next decade.

Robert Mnookin and Lewis Kornhauser's 1979 article "Bargaining in the Shadow of the Law" reframed how divorce should be analyzed. Most divorces are not litigated; they are settled by the parties' lawyers based on what would happen in court. The legal regime matters because it sets the default for settlement bargaining. Under fault regimes, the threat of contested fault litigation shaped settlements. Under no-fault, the parties bargain in the shadow of default property and support rules. Mnookin's framework reoriented family law scholarship away from courtroom-centric analysis toward the negotiated settlements that constitute the bulk of divorce practice. It also revealed that the law's distributive impact comes as much from default rules as from litigation outcomes.

The current frontier in divorce law concerns post-divorce co-parenting, the role of mediation versus litigation, and the financial consequences of long marriages with significant income asymmetry. No-fault is settled in most of the developed world. The contested questions are downstream: how should marital property be divided when one spouse has built a business during marriage; how should spousal support be calibrated when one spouse leaves a career to raise children; how should custody be allocated when both parents work; how should pension and retirement assets be divided. These are the questions that occupy family courts now, and they reveal that no-fault did not end the distributional struggle, it relocated it.

1. Kay, Herma Hill. "Equality and Difference: A Perspective on No-Fault Divorce and Its Aftermath." University of Cincinnati Law Review 56, no. 1 (1987): 1-90.

2. Kay, Herma Hill. "From the Second Sex to the Joint Venture: An Overview of Women's Rights and Family Law in the United States during the Twentieth Century." California Law Review 88, no. 6 (2000): 2017-94.

3. Weitzman, Lenore J. The Divorce Revolution: The Unexpected Social and Economic Consequences for Women and Children in America. New York: Free Press, 1985.

4. Hetherington, E. Mavis, and John Kelly. For Better or for Worse: Divorce Reconsidered. New York: W.W. Norton, 2002.

5. Mnookin, Robert H., and Lewis Kornhauser. "Bargaining in the Shadow of the Law: The Case of Divorce." Yale Law Journal 88, no. 5 (1979): 950-97.

6. Brinig, Margaret F., and Douglas W. Allen. "'These Boots Are Made for Walking': Why Most Divorce Filers Are Women." American Law and Economics Review 2, no. 1 (2000): 126-69.

7. Parkman, Allen M. No-Fault Divorce: What Went Wrong? Boulder, CO: Westview Press, 1992.

8. Parkman, Allen M. Good Intentions Gone Awry: No-Fault Divorce and the American Family. Lanham, MD: Rowman & Littlefield, 2000.

9. Wolfe, Linda. Playing Around: Women and Extramarital Sex. New York: Morrow, 1975.

10. Cott, Nancy F. Public Vows: A History of Marriage and the Nation. Cambridge, MA: Harvard University Press, 2000.

11. Glendon, Mary Ann. Abortion and Divorce in Western Law. Cambridge, MA: Harvard University Press, 1987.

12. Peterson, Richard R. "A Re-Evaluation of the Economic Consequences of Divorce." American Sociological Review 61, no. 3 (1996): 528-36.