Slavery developed in southern colonies due to large populations of native americans died due to the diseases the colonists brought over and then the indentured servants from england did not have the skill set necessary for cropping/harvesting tobacco but they realized people from africa were used to the labor intensive work and were able to work long hours in the sun which led to the spread of slavery through triangular trade.
<span><u> Downfall of Mali Empire:</u> </span>Weakened by attacks and internal rewbellion. The Mali lost it's hold on the Gold and Salt trade. The Songhai empire was then able to grow in power and take previously held Mali territories.
<u> Downfall of Songhai Empire:</u> The moroccan armies invaded songhai, which led the fall of songhai empire.
<u> D</u><u>ownfall of Ghana Empire</u>:In the 11th century, when the Almoravids, a militant confederation of Muslims, began to attack the empire and even conquered it for a time. Though their grip on power did not last long, the chaos they brought to the region destabilized trade, hurting the empire's sources of income.
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Valley of mexico, or as in the andes and all that.
