I dunno, "discontent" is a pretty politically charged word, going back to Shakespeare - "Now is the winter of our discontent" from Richard III is referring to an attempted political overthrow.

Unhappiness sounds much more pedestrian.

It's referring to a successful political overthrow.

The quote really needs the first two lines:

  Now is the winter of our discontent
  made glorious summer by the sun of York.

The verb in the sentence is "is made", not just "is". "Now" it is summer, not winter. They were discontent in the past. Now they are happy.

York (Richard's brother, Edward, now King Edward IV) has overthrown King Henry VI. There's also an important pun: "York" also refers to their father, also named Richard, who was the Duke of York until his death at the hands of Henry's faction. So Edward is also the "son of York".

That said, Richard is being sarcastic. He's plotting the next political overthrow, which will also be successful. And who will in turn be overthrown again. That, at least, will put an end to it, if for no other reason than that literally everybody else is dead.

Leave it to Shakespeare to use a garden-path sentence to open one of his greatest plays....

One of my most important jobs as a Shakespeare actor is to find ways to enunciate some of his over-long sentences in a way that allows the audience to follow them just by listening.

In this case, it's not too hard. Shakespeare likes giving you oppositions, like "winter" and "summer". Put the stress there, and the audience will follow. And you don't need to breathe at the end of the line; it can flow directly into the next one.

It's only fifteen words! And very straightforward.

Authoritarianism is usually imposed from above, not below.

In democracies, you sometimes can see authoritarians being elected. Current situation in the USA is one example.

Not really. The US situation is engineered so only two parties ever get in, and are practically impossible to remove. Wait several years and the other lot will get in.

Even with Trump we see a lot of policies and directions that the Democrats have pursued previously.

You have much better (concrete) examples in South and Centeral America, e.g. Venezuela & Nicaragua, but there are plenty of others.