That is essentially true.
The pivotal year was 1978, in my opinion, when the nation turned in an ugly and hateful direction, but the process has accelerated with astonishing speed since 2001.
Enemies of the American Dream, whether they be Arabs, white supremacists, Russians, or any other subset of ordinary groups or nationalities, just want to sow fear and anger, by any means necessary, to destabilize and unravel the fabric of our society, which they view as a threat to their own worldview.
There is no more stark indicator than the stonewalling of climate change - just a year earlier Al Gore had made global warming an important component of the presidential election that he rightfully won.