Tribalism in the modern era.
It seems that in order to exist in the modern world, you need to belong to one or more tribes. The tribes of old have diminished and died off, there are very few people in the world that would identify as being a member of the Celts, Gauls, Rhaetians and Swabians, Vistula Veneti, Lugii and Balts tribes.
Had you asked me what I would consider tribal a few years ago, I would have said that football or baseball suppport would follow the tribal model quite well, the fans follow the same team, wear the same colours, fight the opposing tribes and to some extent embrace the same ideals
With the rise of the internet, and the spreading of information ad miss-information, prominent current tribes seem to be ‘Anti-vax’, or Anti-Mask, or Pro/Anti-Trump.
Membership of one tribe almost always seems to lead to membership of others too, so for once in the world we have tribes that are segregated in a way that looks a lot like a Venn diagram.