What is the main idea of this excerpt? By not purchasing products from its own manufacturers, the South helped enrich the North. Even though the South had resources it could tap, it relied heavily on the North. All the materials for a Southern burial could only be gotten from

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the North. Because agriculture was so profitable, the South chose not to make use of its other natural resources.

The main idea of this excerpt is that the South chose not to utilize its own manufacturers and natural resources, which ultimately led to the enrichment of the North and a heavy reliance on it.