another important ethnic group, africans, first arrived as slaves. many came from guinea-bissau, or from west african countries – by the end of the eighteenth century many had been taken from the kingdom of kongo and modern-day angola, congo, mozambique, benin and nigeria. by the time of the end of the slave trade in 1850, around six million slaves had been brought to brazil–50% of all slave traffic between africa and the americas. nowadays, there are still small immigration waves coming from the african continent.