How did the cold war (between the us and soviet union) impact other countries around the world?

Which events are correlated but do not necessarily have a causal relationship?

How did slavery end in the united statesa. it ended with the emancipation proclamationb. it ended when the union won the civil warc. it ended with the fifteenth amendmentd. it ended with the 13th amendment

The source of wealth for the city-states of the east african coast was trade between the interior of africa and the far east. true false