A tribal state is basically just a 'country' organized around a tribe. For example, the Arverni people are a 'Tribal State'...the Aedui are a 'Tribal State'.
It's just a political grouping of people based on ethnicity, religion, common ancestry, etc. into a loosely centralized body that has control over territory, some sort of military potential, and so on. In EB2 terms it's basically just a different culture, but in real life a Tribal State would theoretically be less centralized and less organized than the Roman Republic or a Hellenic State.
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