These included Kilwa, Sofala, Mombasa, Malindi, and others. The city-states traded with inland kingdoms like Great Zimbabwe to obtain gold, ivory, and iron. These materials were then sold to places like India, Southeast Asia, and China. These were Africa's exports in the Indian Ocean Trade
A. The recession worsens into a depression because more people are becoming unemployed and without a job.
I'm sure that it is the US had abundant natural resources.
The answer is letter a i think