How did its geography affect movement in Africa

Because of desertification, The Africans were forced to move south is the correct answer.

Explanation:

monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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the answer to your question is c