I'd argue that from the renaissance to now there have been moments of setbacks but none were permanent. As I said, history can go backwards, but in the last few hundred years none of those reversals lasted. Society has become less tolerant of waves of violence, more open to dialogue across classes and cultures and the governance structures we have built have only become more robust whilst the political arena is more accessible than ever. The United States is now an example, as it's an enormous testament to its governance structures that Trump, despite trying his absolute hardest, was not able to actually unroot and destroy national and international agreements, governance and society. In Western countries power seems to have been distributed and checked to an extent that the same fascists of old can't hope to achieve much in the near term. This is not a premature victory lap, I know the ills that gave rise to Trump are not gone, but the constitution, democratic institutions and bureaucratic apparatus have proven themselves to be resilient. Dismantling them is not easy, even in 2 party states with relatively large concentration of executive power in the presidency.
Since the 1990s we've also entered a fundamentally transformative age through the increased technologisation of society (for lack of a better term). I'm not sure to what extent philosophy has picked up on that, but there's several things to consider. First, the internet has made it so that we are no longer restricted to our direct social-political-intellectual frameworks or even social classes in our interaction with the world. This is huge: not only can you consume media from all over the world, you can strike up a conversation with anyone, anywhere, anytime, even participate in global communities of various sizes (of which this is one) only limited by the languages you speak. You have the entirety of human knowledge at your fingertips and information can flow across national & cultural barriers freely, seemlessly and instantly. Even though as we've seen this freedom of interaction/information can be chaotic, can certainly be abused, the positives are enormous. Not only does it humanise people across barriers we never could cross before & lift everyone to a higher educational standard, the linking up of every human being to this worldwide network and its complete incorporation in the way we function in our daily lives, work and private, has also strongly increased interdependence within and among societies in all aspects of their basic functioning. Real social upheaval is much less likely in such a connected & interconnected environment, even though we clearly see anti-globalist movements (which I believe are bound to fail in an overpowering global network).
A second aspect is the increased technological complexity, alongside the fact that every individual is subjected to technological necessity & dependency. This is a bit of a harder topic to tackle because it's not at all limited to just the period since the 90s. Let's look at it from a perspective on organised violence: it's commonly understood that the invention of firearms and explosives was one of the great equalisers in history. Heavily armoured knights on horseback no longer ruled the battlefield, and the commoners could through their numbers and with only modest means easily rise up against the elite structures that had dominated their lives for hundreds if not thousands of years. The age of the musket was certainly the age of democratic reform and individual rights, but it also made for a very volatile time of revolutions and uprisings. The 20th century saw a partial reversal of this trend, through mechanisation demanding much more organisation against an adversary, but there still was a necessity of fielding large (conscript) armies. The scale and brutality of violence increased to such an extent and affected so many the experience of wars gave impetus to a very strong push in further stabilising governance and securing individual rights. M.A.D. also continues to help enforce some manner of peace among great powers.
In the 21st century digitalisation, while some argued it as a new equaliser of sorts through examples like the Arab Spring, actually more firmly than ever allows for concentration of power in state hands and peace between states. This may not be as bad as it seems: in a society built firmly on democratic institutions and individual rights it is more difficult than ever to organise (violent) dissent, which is a powerful catalyst for fascist/ultranationalist movements etc. Any group that engages in terror activity or wishes to foment an uprising will have a very hard time hiding themselves and their intent from authorities. Despite having experienced some terror attacks recently, hundreds more have been prevented. The ones that do succeed are minimally organised and often lone wolves or small networks. This increase in control is again a double edged sword in a sense, as you can see the Chinese surveillance state being built with a very different purpose in mind, but here it can help safeguard the liberalism and democratic principles entrenched in our laws and institutions. As for peace between states: as most of our critical infrastructure and lives now depend on digital means, destroying communication networks, the digital processes that run energy & water supply or any other number of critical functions, would absolutely cause collapse. Beyond the argument of interconnectedness, our collective fragility has in a sense increased and highly developed powers should be wary of engaging in any sort of conflict with eachother, even if they don't have nukes.