 For example, the ivory demand and the ivory exports from Mozambique grew, followed by the demand for slaves outside Africa ravaging the Zambesi valley people as well as all others in the rivers of Sena region.The violence and capture of human beings to be sold as slaves grew in late 18th century, and both Islamic and Portuguese official documents of that era refer to slaves as Kafirs.Alternatively, the slaves for export were called "Caporros" by the Portuguese landowners inside Mozambique.