Los Morenos were black slaves brought to Bolivia by the Spanish and the Portuguese. So many of the black slaves who were brought to the high altitudes to work in the gold and silver mines died because of the hard work and lack of oxygen. The slave owners realized what was happening and moved many of their slaves to the lowlands to work in the jungles. That's why today there is a large black population in the jungles of Bolivia in the coca and coffee plantations. The Africans adapted the Aymara culture of the altiplano and when they were moved to the jungles, they took the Aymara culture with them. So, today you will see black people in the jungles of Bolivia wearing traditional Aymara clothing and the black women will were the bolo hats that are seen worn by the indigenous peoples on the altiplano.