What was an effect of Columbus exploration for the Spanish?

Indian populations in the Andes and in North America were also decimated. The development of the African slave trade was another important consequence of Columbus's voyage. Within decades, Spain introduced black slaves and sugar plants into the New World. This exchange benefitted Europeans more than Native Americans because Europeans spread smallpox , a deadly disease, to Native Americans when they came into contact with them. Missionaries converting Native Americans to christianity, specifically Catholicism was another effect. This was often done by force..

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the answer is d. give brainliest if right.

ps is this 7th grade civics?