Dietary fiber or roughage is the indigestible portion of food derived from plants. It has two main components: 1  Soluble fiber, which dissolves in water, is readily fermented in the colon into gases and physiologically active byproducts, and can be prebiotic and viscous.ietary fiber or roughage is the indigestible portion of food derived from plants. It has two main components: 1  Soluble fiber, which dissolves in water, is readily fermented in the colon into gases and physiologically active byproducts, and can be prebiotic and viscous.
The Portuguese were the first to engage in the New World slave trade in the 16th century. Between 1418 and the 1470s, the Portuguese launched a series of exploratory expeditions that remapped the oceans south of Portugal, charting new territories that one explorer described as oceans where none have ever sailed before.
Source: The Slave Trade, Hugh Thomas, 1997 The slave trade was abolished by Britain in 1812, and subsequently by all other European countries. Portugal and France, though, continued to import slaves, although as contract labourers, which they called respectively libertos or engages a` temps.n 1807 Britain outlawed slavery. In 1820 the king of the African kingdom of Ashanti inquired why the Christians did not want to trade slaves with him anymore, since they worshipped the same god as the Muslims and the Muslims were continuing the trade like before.