critics say the definition of who is Black or not is very subjective. Magnoli describes Brazilian society as not divided between races, but between the poor and the rich, while acknowledging that it is widely agreed that people of darker skin color have suffered an "additional discrimination". History Slavery Iberian explorers and early slavery in the Americas The first Spaniards and Portuguese explorers in the Americas initially enslaved Amerindian populations. Sometimes this labor was available through existing Native American states that fell under the control of invading Europeans; in other cases, Native American states provided the labor force. In the case of the Portuguese, the weakness of the political systems of the Tupi-Guarani Amerindian groups they conquered on the Brazilian coastline, and the inexperience of these Amerindians with systematic peasant labor, made them easy to exploit through non-coercive labor arrangements. However, several factors prevented the system of Amerindian slavery from being sustained in Brazil. For example, Native American populations were not numerous or accessible enough to meet all demands of the settlers for labor. In many cases, exposure to European diseases caused high levels of mortality among the Amerindian population, to such an extent that workers became scarce. Historians estimate that about 30,000 Amerindians under the rule of the Portuguese died in a smallpox epidemic in the 1560s. The Iberian conquerors could not attract sufficient settlers from their own countries to the colonies and, after 1570, they began increasingly to bring enslaved people who had been kidnapped in Africa as a primary labor force. Enslaved People of African Ancestry in the Americas Over nearly three centuries from the late 1500s to the 1860s, Brazil was consistently the largest destination for African slaves in the Americas. In that period, approximately 4.9 million enslaved Africans were imported to Brazil. Brazilian slavery included a diverse range of labor roles. For example, gold mining in Brazil began to grow around 1690 in interior regions of Brazil, such as modern-day region of Minas Gerais. Slaves in Brazil also worked on sugar plantations, such as those found in the Captaincy of Pernambuco. Other products of slave labor in Brazil during that era in Brazilian history included tobacco, textiles, and cachaça, which were often vital items traded in exchange for slaves on the African continent. Slave life, Creole populations, and abolition The nature of the work that slaves did had a direct effect on aspects of slaves'