How did the discovery of oil in texas led to better road construction

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.

i'll anser so they can have brainliest (my doubleu key is broken)