Answer:
they are :-
1. European destroyed all the system in large area of Africa when they develop the trade in enslaved African.
2. Local system were badly affected and overwhelmed by the demand of new trade in enslaved African, a trade imposed by tbe better developed guns and ship of the Europeans.
3. The European bought new disease to west Africa, for example smallpox and tuberculosis had a devastating impact on the population of West Africa.
Explanation:
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