How does use of cargo containers benefit the economy? O A. By decreasing pollution
B. By generating renewable energy
O C. By keeping distribution costs low
D. By preventing protective tariffs

Explanation is in the file

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- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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is slave