Answer :

Because the cotton gin was a tool that helped make the production of cotton way faster than just picking it out. Therefore, by making cotton available faster, the slave master thought that the more the slaves, the more the cotton, the more the cotton, the more money they make. 
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A modern mechanical cotton gin was created by American inventor Eli Whitney in 1793 and patented in 1794. ... It revolutionized the cotton industry in the United States, but also led to the growth of slavery in the American South as the demand for cotton workers rapidly increased.

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