The invention of the cotton gin by Eli Whitney in 1793 transformed the American South by making the removal of seeds from upland cotton profitable. This technological shift led to cotton becoming "King," dictating political and labor policies while leveraging enslaved people as collateral for Northern banks. The hosts emphasize that an experienced picker could harvest 250 pounds of cotton a day by hand, a labor-intensive process that built the nation's economic might before the mechanical picker was introduced in 1927.