I don't feel this as off topic. Nation is a much newer concept than clans and tribes in human history. The same problems happened before in early 20th Century

I don't feel this as off topic. Nation is a much newer concept than clans and tribes in human history. The same problems happened before in early 20th Century China. Both Nationalists and Communist governments in China tried very hard for a long time to remove clan and tribal influence and a lot of bloody consequences happened. So this is part of social science. (though social science is political and not real science).