In England, Romans built a vast network of roads to connect the cities that they established, as well as aqueducts and irrigation systems. They built water supply systems and things like sewage systems. Many of the roads used today were originally made by the Romans, except they were rebuilt from contemporary materials, just at the same place.
Islam's history on the African continent is rich, more than a millenium of expansion, scholarship, conquest, empire and theological development. ... The historial impact of Islam upon trade, particularly in West Africa, greatly increased the wealth of African people and helped form many great African empires.
If I’m correct, they came mainly from: SOUTHERN AND EASTERN EUROPE
A primary source would be a film review.
If you would like to know about somebody thinks about a certain movie, then the best way to obtian knowledge on this would be to read his film review which he or she had posted before.