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Answer:
O <em>Conditions in the south after reconstruction led many African Americans to migrate</em>.
Explanation:
Fits best with the story.
A political machine is a political organization in which an authoritative boss or small group commands the support of a corps of supporters and businesses (usually campaign workers), who receive rewards for their efforts. The machine's power is based on the ability of the workers to get out the vote for their candidates on election day.
