Checks and balances? Did they give you answer choices?
The reason he wasn't able to finish his speaking tour was because he had a stroke, so he died.
Camel caravans from North Africa carried bars of salt as well as cloth, tobacco, and metal tools across the Sahara to trading centers like Djenne and Timbuktu on the Niger River. Some items for which the salt was traded include gold, ivory, slaves, skins, kola nuts, pepper, and sugar