PONG
I think people have been convinced moral decline has been destroying the nation since 1776.
Yes, at least in a historical context, and at least on a somewhat-temporary basis. See Gaius Aurelius Valerius Diocletianus, the Roman emperor who actually managed to stave off the inevitable collapse and begin to reverse it between 284 and 304. He made some mistakes, but he bought the Roman Empire almost two centuries.