Answer:
Samurai were employed by feudal lords (daimyo) to defend their territories against rivals, to fight enemies identified by the government, and battle with hostile tribes and bandits. For this reason, samurai could live in barracks, in a castle or in their own private homes.
Slavery started because people couldn't do their jobs themselves, so they had other people do it for them.
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The Columbian Exchange was a exchange of animals, culture, food and technology, between the old and new world. Letter d).
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I think the answer is
A. Southern plantation owners