In what way did the European slave trade enable centralizing states to expand more rapidly?
a. The slave trade was restricted to the coasts, leaving the political units of interior Africa free of European interference.
b. Slaves were traded for firearms that allowed expanding states to overpower their neighbors, resulting in more slaves.
c. The slave trade declined in the cross-Sahara trade routes leading to the introduction of stronger Muslim kingdoms.
d. The Europeans rapidly created military alliances and added their armies to those of their slave-trading allies.
e. The European slave trade weakened the states of central and western Africa, allowing the centralizing states of eastern Africa to expand without competition.
Answer: B