Answer:
Option A expresses the greatest lasting effect of the Atlantic slave trade, even after it was declared illegal.
Step-by-step explanation:
A. African slavery in the Americas continued on a large scale.
While Options B, C and D reference other impacts, they do not represent effects that lasted beyond the abolition of the slave trade. Consider the evidence:
B. There were not enough jobs for all of the freed Africans in Europe and the Americas.
This occupation imbalance largely concerned the immediate aftermath of abolition, without indicating a prolonged impact.
C. Africans were able to take back control of their native countries.
Sadly, Africans did not gain control of their homelands at the time the slave trade was outlawed.
D. Slave traders moved on to exploiting indigenous peoples in the Americas.
While exploitation of native peoples did occur, it does not represent an effect that lasted beyond abolition specifically.
Therefore, of the options given, only Option A identifies an impact that endured even after the slave trade was declared illegal: African slavery continued on a large scale within Americas for some time after the trade itself was abolished.