Not quite sure what this decline is. Would you explain? Yes, there are remnants of old hatreds that threaten what we have achieved but, in fact, we're healthier, better fed, better off financially, more peaceful at home and abroad and generally better off by most metrics.America’s decline started long before Trump.
It's true that the Republican Party, who long touted themselves as the party of integrity, personal responsibility and patriotism has forsaken every one of those. At least, I can't think of a single leader in that party who encapsulates any of those virtues. They, like many of their supporters, put power and privilege over party.
That's neither America or democracy.