As opposed to most of the controversies of the early 1960s, most of the protests of the late 1960s were centered around

C. the Vietnam War

Explanation:

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.