- There were already laws allowing divorce for adultery and abuse, and I doubt that was the reason for the monumental rise. I would add a financial incentive have been added to divorce in terms of child support and alimony. No-fault divorce started to require financial obligations from the bread winning spouse in divorce without even just cause.
I’m not sure about the dates, but there’s probably a problem with your chronology, as the rise in the divorce rate went hand in hand with the fading away of alimony as an institution.
Alimony used the be very much the rule around mid-century in the US–it’s now only a shadow of its former self.
Here’s an old newspaper article from 1986, in which Betty Friedan is regretting the fact that feminists attacked the old system of alimony:
“A series of divorce laws pushed into practice by the women’s movement should be changed because they penalize women who deserve alimony, author Betty Friedan and other feminists said Wednesday.”
"’‘There is a false illusion of equality in current divorce proceedings,’’ Friedan said at the annual meeting of the American Sociological Association. She called reform divorce laws, enacted over the past 15 years in almost every state, '‘male models for equality . . . that penalize women.’
"Friedan, who wrote The Feminine Mystique in 1963 and is credited as a founder of the women’s movement, called for a change in the newly enacted divorce laws – the same laws supported by the women’s movement in an effort to make the courts treat women equally with men.
‘‘Very early on, women said we don’t want alimony, it’s a form of dependence,’’ said Harvard sociologist Lenore Weitzman. ‘‘We thought it was a trap and now we see it is a lifeline.’’ She presented studies that show a woman’s income drops the first year after divorce while the man’s standard of living can increase by more than 100 percent. She said recent census figures show 85 percent of divorced women do not receive alimony."
articles.orlandosentinel.com/1986-09-04/news/0250190057_1_alimony-divorce-equality
So, heck if I understand why alimony has recently turned into a bogeyman–in most of the US, alimony (particularly life-long alimony) is not a thing. A few years of spousal support is the most anybody can count on these days in much of the US (although I realize that things are difference in parts of the NE).
I can’t seem to find anything right now (google alimony and feminists and you get mostly garbage), but historically speaking, there was a feminist push to destroy the old alimony system in order to shove women into the workforce.