So you have these different levels of meaning, based on the study of Rhetoric and Social Psychology.
In order of small to big:
Individual–>Group (limited at number x of individuals)–>Intergroup/Community(between #—–>#)–>State/Province—>Nation/Culture (incl. Indigenous Nations)–>Region–>Inter-Regional.
As history goes on, they get bigger, first due to Human Migration patterns (which you can track through DNA and genetic backgrounds of ppl), then in terms of nomadic and then hunter and gatherer peoples, then in terms of other human constructs of development like writing, technology, et. al. It’s not a fair definition, and it’s bound to piss off a lot of people, but maybe if we can study Social Movements (which is already done by some cultural anthropologists, historians, and philosophers around the world and through the span of time), then we can figure out a good conceptual model to talk about the relations between all people, and how they have been affected by serious issues.
With that knowledge, you could work your way down. People already do this. But maybe if there was a meta-analysis of people’s life-spans (you could even maybe use bits and pieces of blog sites like WordPress, I swear), then we could talk about the similarities between specific people in a really obscenely precise way.
Either that, or we could just make some friends.