To say that "cotton was king" is to say that it was the primary cash crop. Agriculture in the southern states included other crops, but the main export crop was cotton. A combination of the cotton...
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The cotton gin made it faster to pick and clean the cotton. This increased the need of slaves.
i don't know I'm just a 10 year old
Because the invention of the cotton-gin had made it easy to harvest, and there was a limitless world demand for cotton products.