The Swahili city-states
a. Succeeded in uniting Africa for the first time
b. Strongly maintained their Christian roots
c. Dominated trade along the east Africa coast
d. Became the dominant political force in west Africa after the collapse of the Mali kingdom
The Swahili city-states "c. Dominated trade along the east Africa coast," since this was a major hub for trade not only within Africa itself, but also throughout the world.
