Why did barracoon remain unpublished for nearly a century

You are reffering to Barracoon: The Story of the Last "Black Cargo"

It is a non-fiction book recounting the interview the author had with Cudjo Lewis, who was the last living survivor of the Middle Passage. This was the stage of the trangular trade in which millions of Africans were shipped to the new world s part of the Atlantic slave trade. It wasn't initially published because it was written in vernacular and because it detailed the involvment of other Africans in the slave trade, condemning their own.

The book was finally published in 2018.

The answer is You are referring to Barracoon: The Story of the Last "Dark Cargo"  

Explanation:

It is a verifiable book relating the meeting the writer had with Cudjo Lewis, who was the last living over comer of the Middle Passage. This was the phase of the triangular exchange which a large number of Africans were delivered to the new world s part of the Atlantic slave exchange. It wasn't at first distributed in light of the fact that it was composed in vernacular and on the grounds that it nitty gritty the contribution of different Africans in the slave exchange, denouncing their own.  The book was at long last distributed in 2018.

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