How the West Africans used it to maintain their empires.

The king of Ghana spread his power through trade. Gold, ivory, and slaves were bartered for salt from the Arabs. Horses, cloth, swords and books were bartered from North Africans and Europeans. Ghana achieved much of its wealth by trading with the Arabs.

the  wilmot proviso  was designed to eliminate  slavery  within the  landacquired as a result of the mexican war (1846-48). fearing the addition of a pro-slave territory, pennsylvania congressman david  wilmot proposedhis amendment to the bill.