Question: Trade beads (sometimes called aggry and slave beads) were otherwise decorative glass beads used between the 16th and 20th century as a token money to exchange for goods, services and slaves (hence the name), this included the African slave trade, slavery has existed in Africa for how long?
Sentence (from "Slavery in Cuba"): More than a million African slaves were brought to Cuba as part of the Atlantic slave trade; Cuba did not end its participation in the slave trade until 1867.
Relevant evidence: No