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Pemba, an island off the coast of Tanzania, was intermittently an independent polity and a Portuguese possession in the period 1507-1698.
Explanation
Sources
The video shows the evolution of the polity. The slides always depict the subject and other polities that were involved in the territorial changes.
Polities are the smallest unit in the Phersu Atlas model. They represent political entities that control a territory, regardless of their form. Polities can be either independent or dependent.
Based on the overall Phersu Atlas Model and its comprehensive sources.