More farming and plots.
Explanation:
More farming and plots mean it needs people to take care of it and harvest them . More slaves means a solution to that problem
Supported by the unspoken threat of a powerful military president roosevelt used big stick diplomacy in many foreign policy situations
I believe that the answer to the question provided above is that the <span> the growth of what industries brought corresponding changes in labor needs which lead to the addition of slaves in their labor force.</span>
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