The table below shows the 2010 Trade figures for these three geographic locations as a total for 2010 in millions of US$.
The table below has imports INTO the USA and Exports from the US.
|Country||Total Exports $||Total Imports $|
|USA - Africa|| |
|USA - Canada|| |
|USA - Germany|| |
Clearly, the African people are not suffering from excessive trade with the USA or cannot be said to be exploited by the USA (They are by their own governments, but this is a separate issue).
In fact, the nature of money is that it can be used to purchase goods and services. The more trade there is in Africa, the more food and essential goods that the people there will be able to buy.
Simple answer, more trade will help these people come out of poverty and this means more companies making goods that others want.
 "World Population Prospects: The 2010 Revision" United Nations (Department of Economic and Social Affairs, population division)
 Statistics Canada
 CIA World Factbook