I can appreciate the argument. The US for example has moved to illegalise abortions and be hostile towards immigrants. And to some extent there was a global move away from authoritarianism in the late 20th C which seems to be stalling.
But you can't forget that the US even in mid/late 20th and early 21st centuries underwent a host of authoritarian changes:
* Prosecuting unjustified (and in some cases unpopular) wars in Korea, Vietnam, Afghanistan and Iraq
* Aggressive support of violent coups and regime changes in South America and the Middle East, usually in favour of right-wing authoritarian strongmen
* Illegalising psychoactive substances for medical or recreational use, simultaneous with testing those drugs on unwitting US citizens
* Spying and surveillance against US journalists and activitists
* Political suppression and even persecution of left-wing ideas
* Increasing militarisation of police and use of violent means such as tear gas or rubber bullets to control protests