Answer:
Southern economy was dependent on slave labour because they grew labour intensive cash crops. The south was mainly dependent on agriculture and farming as the main economy , and to maintain large plantations and fields slave labour was needed.
Explanation:
The main reason the Southern economy was dependent on slave labor because enslaved workers planted and harvested crops on plantations.
Therefore we can conclude that the Southern economy was dependent on slave labour.
Thus option B. is the correct answer.
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