I think the answer to this is A
The canals good could could now be shipped directly. Rivers provided faster chapter and more efficient.
Trans-Saharan trade requires travel across the Sahara between sub-Saharan Africa and North Africa. While existing from prehistoric times, the peak of trade extended from the 8th century until the early 17th century. ... Cattle were introduced to the Central Sahara (Ahaggar) from 4000 to 3500 BC.
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All civic participation are important to society. When people protest, they show to the government their needs.
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