<Table> <Tr> <Th> Part of a series on the </Th> </Tr> <Tr> <Th> History of Portugal </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Td> Ancient (show) <Ul> <Li> Prehistoric Iberia </Li> <Li> Pre-Roman Peoples </Li> <Li> Roman conquest of Hispania </Li> <Li> Romanization of Hispania </Li> <Li> Lusitania </Li> <Li> Gallaecia </Li> <Li> Suebic Kingdom </Li> <Li> Visigothic Kingdom </Li> </Ul> </Td> </Tr> <Tr> <Td> Medieval (show) <Ul> <Li> Umayyad conquest of Hispania </Li> <Li> Al - Andalus </Li> <Li> Gharb Al - Andalus </Li> <Li> Almoravid dynasty </Li> <Li> County of Portugal </Li> <Li> Reconquista </Li> </Ul> </Td> </Tr> <Tr> <Td> Afonsine (show) <Ul> <Li> Portugal in the Middle Ages </Li> <Li> Portuguese House of Burgundy </Li> <Li> 1383--85 Crisis </Li> </Ul> </Td> </Tr> <Tr> <Td> Age of Discoveries (show) <Ul> <Li> Imperial expansion </Li> <Li> House of Aviz </Li> <Li> Portuguese Renaissance </Li> <Li> Portuguese Empire </Li> <Li> War of the Portuguese Succession </Li> <Li> Iberian Union </Li> </Ul> </Td> </Tr> <Tr> <Td> Brigantine (show) <Ul> <Li> Restoration and Pombaline Era </Li> <Li> Restoration War </Li> <Li> House of Braganza </Li> <Li> Imperial decline, war, and revolt </Li> <Li> Transfer of Court </Li> <Li> Liberal Wars </Li> <Li> Constitutional Monarchy </Li> <Li> 1910 Revolution </Li> </Ul> </Td> </Tr> <Tr> <Td> First Republic (show) <Ul> <Li> First Republic </Li> <Li> Monarchy of the North </Li> <Li> Portugal during World War I </Li> <Li> 1926 coup d'état </Li> </Ul> </Td> </Tr> <Tr> <Td> Second Republic (show) <Ul> <Li> Ditadura Nacional </Li> <Li> Portugal during World War II </Li> <Li> Estado Novo </Li> <Li> Portuguese Colonial War </Li> </Ul> </Td> </Tr> <Tr> <Td> Third Republic (show) <Ul> <Li> Carnation Revolution </Li> <Li> Processo Revolucionário Em Curso </Li> <Li> Transition to democracy </Li> <Li> Third Republic </Li> </Ul> </Td> </Tr> <Tr> <Td> Topic (show) Archives - Economy - Language - Military - Music </Td> </Tr> <Tr> <Td> Regions (show) <Ul> <Li> Azorean history </Li> <Li> Madeiran history </Li> </Ul> </Td> </Tr> <Tr> <Th> Timeline </Th> </Tr> <Tr> <Td> Portugal portal </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Part of a series on the </Th> </Tr> <Tr> <Th> History of Portugal </Th> </Tr> <Tr> <Td> Ancient (show) <Ul> <Li> Prehistoric Iberia </Li> <Li> Pre-Roman Peoples </Li> <Li> Roman conquest of Hispania </Li> <Li> Romanization of Hispania </Li> <Li> Lusitania </Li> <Li> Gallaecia </Li> <Li> Suebic Kingdom </Li> <Li> Visigothic Kingdom </Li> </Ul> </Td> </Tr>

How did the portuguese obtain most of their african slaves