Political Memes

Well, the classic definition of right and left is in accordance with or opposition to the king, respectively.

I think it moved from there to pro- / anti-monarchism when the notion of monarchy was challenged in the 19th century.

After the French revolution, foreign neighbors demands France select a new king under threat of war. The War of the First Coalition results and Napoleon shows them what's what. Then Napoleon declares himself emperor and declares a bunch of civil rights to get everyone on board. Later, during the Bourbon restoration, Charles X rolls those rights back necessitating a second revolution. It'll take about seventy years or so before France establishes a proper republic, and another thirty-ish years to re-establish rights. And there are some controversies today, such as the right to practice Islam and wear a burqa.

These days, we see multi-party democracies as the most liberal, but voters can be manipulated, as per the Southern Strategy. Today, a massive far-right propaganda machine runs in the US 24/7 using the same brainwashing techniques used on US soldiers in Korea. So it's possible democracy is already obsolete due to modern communications and... well, they call it messaging.

One option is sortition, that is, election by lottery. This drastically increases the odds we won't get officials like Ted Cruz or JD Vance (fhat is, shapeshifters who have no principles but can say anything, feigning confidence and sincerity to stay adjacent to power). We'll need redundant checks against corruption and incompetence. We might also need a system that sorts experts from lobbyists, to provide our citizen-officials complete information and a public-serving mandate.

That said, I can't imagine what else leftism can mean. It certainly doesn't refer to command economics such as socialism or communism, since those, on their own, more authoritarian than a free market.