In eastern Africa , the slave trade was multi-directional and changed over time .
This population decline throughout West Africa from 1650 until 1850 was exacerbated by the preference of slave traders for male slaves .
In eastern West Africa , the slave trade was multi-directional and changed over time .
This population decline throughout West Africa from 1650 until 1850 was exacerbated by the preference of slave traders for male slaves .