Or in other terms, create a simple, understandable, and compelling story, for why everyone in this society has something in common, why you should be nice to your fellow man, and why you should co-operate and take part in the society.
Now, good thing for us, is that we've quite literally seen this happen hundreds of times throughout history, it's largely taken the form of Religion in the earliest societies. Religion, is kinda great for kickstarting societies, it takes quite complex themes, and philosophical undertones, and packages them in compelling, and understandable stories and moral lessons. Plus, it's great at defining who is in your ingroup, and who is in your outgroup, which is also key to defining a society.
In a more modern sense, we use citizenship, language, race, and nationality as a definition of your societal ingroup and outgroup. Though many lands still use religion as a fundamental tool of unification.
We also, use completely made up things, I mentioned this earlier, foundation myths. What is a foundation myth? It's a tale, usually grand, detailing in a compelling manner, the epic tale of the foundation of the society. For example in the USA, despite lacking a number of the common modern bindings of a nation state, the USA uses the American revolution, and the civil war, as a way of binding people to the IDEA of the USA.
I'll define these things, religions, nationalities, foundation myths, races, languages, and citizenships, as unification devices. Societies use these, as ways to give members of the society common ground, regardless of differences, which the human mind loves to make big deals out of. This way, the soccer alpha, and the geek nerd, don't actually split out into different warring societies.
A societal collapse is heavily tied with the breakdown of these ideals (cough cough, as we're seeing in the decline of USA). When people don't have this common ground, maintaining integrity becomes nigh impossible.
Ok, so you've got your foundation myth set up, all good right? Nope, you now need to figure out what to do with your society.
All complex societies need some kind of state, an entity, made up of lots of people, that handles the maintenance, and regulation of the behaviours, and livelihoods of humans. How do you justify this weird entity that tells me how to live my life? A state myth. Much like the foundation myth, the state myth essentially should justify why you should listen to the state, and why you shouldn't just REVOLT. For example, in the USA, the state myth, goes hand in hand with the foundation myth. The American revolution, and specifically the idea of "democracy" and the Constitution, which is essentially a holy entity. Both these ideas solidify why this power structure should be trusted, and maintained.
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