One of the things that makes it difficult to track the Divorce Revolution of the late '60s and '70s (and its many dire consequences) is the fact that, after California "started" the revolution on January 1, 1970, the effective date of the Family Law Act of 1969, it's not really clear which states adopted no-fault divorce and when. Dates are hard enough to come by, and differing standards of what "counts" as no-fault divorce law makes it even harder to track.