The spread of Bengali as a dominant language of the delta took centuries. This was not only because of the existence of other vibrant linguistic communities, however. Equally important was the fact that Bengali was not always the language of the rule, ritual or trade. Over the centuries state power in the Bengal delta has been held by a truly remarkable array of non-Bengalis, including Afghans, Turks, North Indians, Arakanese and Ethiopians. Thus there was a remarkable linguistic diversity, and many residents of Bangladesh must have been multilingual.
Identify the most logical conclusion -