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You don’t normally find an educational video on YouTube ticks at 44 minutes mark, but I would strongly recommend you check this out if you are into this kind of things like me. Thoth’s Pill – an Animated History of Writing talks about writing systems across the world and what linguists think, as of present, how they had evolved.
The more you understand this, the more you would realize the traditional definition of ethnic groups/race cease to apply to the real world, and monoculture nation-states will never work beyond a few million people.