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 "Abolitionism"): James Oglethorpe was among the first to articulate the Enlightenment case against slavery, banning it in the Province of Georgia on humanitarian grounds, arguing against it in Parliament, and eventually encouraging his friends Granville Sharp and Hannah More to vigorously pursue the cause.
Relevant evidence: No