>>2110660
Other anons forgot to mention that pops each have their own culture group, specific culture, religion, and class.

A culture group is much larger. For example "Hellenistic" or "Italic", whereas a specific culture is a subset of that.
So you have the Hellenistic culture group, and inside it there's Spartans, Athenians, and so on.
Spartans will hate Athenians because they're of a different culture, but they won't hate them as much as they'll hate Romans, because Romans are of a different culture *group* entirely.

Then you have religion, pretty self-explanatory.

And finally classes: Nobles, Citizens, Freemen, Tribesmen, and Slaves.

In your culture tab you get to decide the max status of each culture in your nation, among other things. For example your primary culture will have max status (they can go up to being Nobles), whereas someone you just conquered you might limit up to Freemen (or even enslave their entire culture by making it so they can't go above Slave)

It's really deep, it's very dynamic, it's pure kino.