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 * Driven by labor demands from new cotton plantations in the Deep South, the Upper South sold more than a million slaves who were taken to the Deep South. Slavery_in_the_United_States
 * Fiori, Nicholas. “Plantation Energy: From Slave Labor to Machine Discipline.” American Quarterly, vol. 72, no. 3, 2020, pp. 559–579.
 * DOI: 10.1353/aq.2020.0035
 * "Early on in the plantation zone, black slaves were used for their metabolic energy alongside mules and horses, but by the turn of the nineteenth century, plantations were fashioned as industrial operations and steam engines began to replace pack animals."