1. "They grew cash crops like rice, tobacco and sugar cane. These
enterprises required increasing amounts of labor."...What was used to
answer this new demand for labor?

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.