sentences:  Until the early 1850s, most enslaved Africans who arrived on Brazilian shores were forced to embark at West Central African ports, especially in Luanda (present-day Angola).Slave labor was the driving force behind the growth of the sugar economy in Brazil, and sugar was the primary export of the colony from 1600 to 1650.Gold and diamond deposits were discovered in Brazil in 1690, which sparked an increase in the importation of African slaves to power this newly profitable mining.