The married family is becoming endangered with now +40% of children born out of wedlock up from 3% in the 1960s.
What happened?
Over the years:
By age: young mothers under 20 nearly all out of wedlock
https://www.childtrends.org/wp-content/uploads/2016/04/indicator_1460649378.8721.html
Over the years by race. Asians are still hanging on, native and black family is falling apart:
Edit: some more info:
Of students in grades 1 through 12, 39 percent (17.7 million) live in homes absent their biological fathers.
http://www.fathers.com/statistics-and-research/the-extent-of-fatherlessness/
Harvard sociologist Robert Sampson has written that “Family structure is one of the strongest, if not the strongest, predictor of variations in urban violence across cities in the United States.” His views are echoed by the eminent criminologists Michael Gottfredson and Travis Hirschi, who have written that “such family measures as the percentage of the population divorced, the percentage of households headed by women, and the percentage of unattached individuals in the community are among the most powerful predictors of crime rates.”
https://ifstudies.org/blog/school-shootings-fathers-divorce-family-structure
