In OTL, the Carthaginians managed to create colonies on the western coast of Morocco and were trading as far as Senegal and Gambia. What if they manage to establish minor settlements in the region, leading to Carthaginian influence. Eventually, as the result of butterflies, West Africans start to trade on the northern coast of Brazil and the Caribbean as early as the 600s or 900s. What would be the effect on Native American civilization? Would the Americas be somewhat more protected from disease?