As noted in Chapter 9, to replace the slave trade from Africa, which had been prohibited by Congress in 1808, a massive trade in slaves developed within the United States. More than 2 million slaves were sold between 1820 and 1860, a majority to local buyers but hundreds of thousands from older states to “importing” states of the Lower South. Slave trading was a visible, established business. The main business districts of southern cities contained the offices of slave traders, complete with signs reading “Negro Sales” or “Negroes Bought Here.” Auctions of slaves took place at public slave markets, as in New Orleans, or at courthouses. Southern newspapers carried advertisements for slave sales, southern banks financed slave trading, southern ships and railroads carried slaves from buyers to sellers, and southern states and municipalities earned revenue by taxing the sale of slaves. Virtually every slaveowner at one time or another bought and sold slaves. The Cotton Kingdom could not have arisen without the internal slave trade, and the economies of older states like Virginia came increasingly to rely on the sale of slaves.

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