Yep, lots of things have. The things surrounding morality as a major issue have gone into the toilet since the 60s. Evolution didn't get into the classroom til about then - between 59 and 63 if memory serves. At which point it all started going to hell in a handbasket. The Nazis were defeated in the 40s - by a generation not profaned by evolution. The soviet Union fell because of the conviction of a single man - Ronald Reagan. And he was fought at every turn by relativists who were sure we'd be slaughtered by the foul beastly commies if we didn't stop talking truthfully about them. You coulnd't call them evil, as a matter of fact, because what is evil when you grew up on evolution, situational ethics and moral relativism. Once you kicked God out of school, you kicked the ten commandments out too.
With that went the foundations of morality in this country.
premarital sex, babies out of wedlock, abortions, etc exploded from that point and have taken us to the abyss.
Lot's of things have happened. They didn't "just" happen. And the impact can't be just waved off. It is there and trackable in the data. And it's across the board, you name the illicit activity and you can track it's progression all the way back to the early 60s when this nation began teaching evolution in schools and kicked God out of the classroom. When your kid comes home with an STD, Aids or something of the like, you can sleep well at night knowing that the choices you make have a major impact on others.
This is a textbook logical fallacy - post hoc ergo propter hoc, that is, "after that, therefore because of that." Just because something happens after a previous event does not mean that the prior event caused it. The decline in American society can be traced to other factors just as easily.
(Incidentally, I would dispute your dates. Evolution was taught in schools in the 1920's too.)
All those terrible things really started happening around the time we sent men to the moon. Coincidence? Think about it!