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The internal slave trade became the largest enterprise in the South outside of the plantation itself, and probably the most advanced in its employment of modern transportation, finance, and publicity. It developed its own language: prime hands, bucks, breeding wenches, and fancy girls. Its routes, running counter to the freedom trails that fugitive slaves followed north, were similarly dotted by safe houses - pens, jails, and yards that provided resting places for slave traders as well as temporary warehouses for slaves. In all, the slave trade, with its hubs and regional centers, its spurs and circuits, reached into every cranny of southern society. Few southerners, white or black, were untouched.
In the half century following the War of 1812, planters and traders expanded and rationalized the transcontinental transfer of slaves. During the second decade of the nineteenth century, traders and owners sent an estimated 120,000 slaves from the seaboard to the west, with the states and territories of Georgia, Tennessee, Alabama, and Louisiana being the largest recipients. That number increased substantially during the following decade and yet again during the 1830s, when slave traders and migrating planters uprooted almost 300,000 black men, women, and children. By this time, though most of the slaves still derived from the Upper South - particularly Maryland and Virginia - their destination had moved further west. Alabama and Mississippi had become the largest recipients, with each receiving nearly 100,000 slaves during the 1830s. The Panic of 1837 and the subsequent decline in cotton and sugar production deflated the price of slaves and the trade slackened for a few years. But prices soon revived and with them the demand for slaves. Nearly one quarter of a million slaves left the seaboard for the interior during the 1850s, with more than half being taken west of the Mississippi River. The 'mania for buying negroes' easily overwhelmed periodic bans against slave importation and did not cease until the arrival of Union troops.
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