I'm not sure if this is where we turned the corner. What is undoubtedly true, however, is that there is very little stigma in the U.S. attached to being divorced or having children out of wedlock anymore. And statistics have proven, over and over again, that single parent female lead households do not commonly produce well-integrated, fully funcitonal adults in comparison to the traditional nuclear family.
And the blame rests equally with members of both sexes. There is practically no excuse for having an "unintended" pregnancy in this country in the 21st century. With the inexpensive, widely available range of birth control devices out there, it is indeed a pair of imbeciles who cannot avoid getting the female "in the family way" if that is truly their intention.
The reality is that Americans are selfish. We are spoiled and self-centered. We divorce at the drop of a hat if "our needs" are not being met, and the fact that children are already part of the equation is rarely a major consideration. And this, of course, only applies to the people who bothered to get married before conceiving in the first place. Many people crank kids out with about as much long-term thought given to the consequences as I give when I choose my next vacation destination. Sacrifice of finances, autonomy, having to endure any number of problems, difficulties with a spouse ... this is not what a lot of Americans are willing to endure over a period of decades. And when things don't go their way they decide that they are their top priority and then behave accordingly. We have the divorce rate and unpaid child support numbers to prove it.
Our values are in decline in this country. We have become, in some respects, like a modern day Rome.