slave trade, a brutal and inhuman way of selling people during the 16th-19th century, the root cause of this inhumane act is racism, most westerners treated African people as savages and animals, most do not understand the African ways. the African people are separated from their families and homes then sold to foreign countries (mostly Europe and north america) ironically the same countries leading this inhumane act (Britain, America, Portugal etc.) opposed and later abolished it
