While investigating the increased warfare in West Africa between the sixteenth and eighteenth centuries, what do many historians argue is the key factor in increasing warfare at large?(1 point)

Responses

varying local currencies, such as nzimbu shells
varying local currencies, such as nzimbu shells

dangerous environments along the Bight of Benin
dangerous environments along the Bight of Benin

the European firearms sale-enslavement cycle
the European firearms sale-enslavement cycle

wars of succession

the European firearms sale-enslavement cycle