Prior to the introduction of the mechanical cotton gin, cotton had required considerable labor to clean and separate the fibres from the seeds.
Whitney's cotton gin model was capable of cleaning 50 pounds (23 kg) of lint per day. The model consisted of a wooden cylinder surrounded by rows of slender spikes, which pulled the lint through the bars of a comb-like grid. The grids were closely spaced, preventing the seeds from passing through. Loose cotton was brushed off, preventing the mechanism from jamming.
Many contemporary inventors attempted to develop a design that would process short staple cotton, and Hodgen Holmes, Robert Watkins, William Longstreet, and John Murray had all been issued patents for improvements to the cotton gin by 1796. However, the evidence indicates Whitney did invent the saw gin, for which he is famous. Although he spent many years in court attempting to enforce his patent against planters who made unauthorized copies, a change in patent law ultimately made his claim legally enforceable – too late for him to make much money from the device in the single year remaining before the patent expired.
The invention of the cotton gin caused massive growth in the production of cotton in the United States, concentrated mostly in the South. Cotton production expanded from 750,000 bales in 1830 to 2.85 million bales in 1850. As a result, the region became even more dependent on plantations and slavery, with plantation agriculture becoming the largest sector of its economy. While it took a single slave about ten hours to separate a single pound of fibre from the seeds, a team of two or three slaves using a cotton gin could produce around fifty pounds of cotton in just one day.
Cotton gin at Jarrell Plantation. Before the American Civil War, the Jarrell's farm was one of the half-million cotton farms in the South that collectively produced two-thirds of the world's cotton.
Like many small planters, the Jarrell family benefited from the development of the cotton gin in 1793 by Eli Whitney, which made it practical to cultivate heavily seeded, short-staple cotton even in hilly, inland areas of Georgia. John Fitz Jarrell built the first permanent structure on the site in 1847. Typical of antebellum cotton plantations, John Jarrell ran the farm with his family and slave labor. By 1860 John Jarrell operated the 660-acre (2.7 km2) farm with the labor of 39 slaves.
The growing international demand for cotton led many plantation owners further west in search of suitable land. In addition, the invention of the cotton gin in 1793 enabled profitable processing of short-staple cotton, which could readily be grown in the uplands. The invention revolutionized the cotton industry by increasing fifty-fold the quantity of cotton that could be processed in a day. At the end of the War of 1812, fewer than 300,000 bales of cotton were produced nationally. By 1820 the amount of cotton produced had increased to 600,000 bales, and by 1850 it had reached 4,000,000. There was an explosive growth of cotton cultivation throughout the Deep South and greatly increased demand for slave labor to support it. As a result, manumissions, the act of an owner in freeing his or her slaves, decreased dramatically in the South.
Most of the slaves sold from the Upper South were from Maryland, Virginia, and the Carolinas, where changes in agriculture decreased the need for their labor and the demand for slaves. Before 1810, primary destinations for the slaves who were sold were Kentucky and Tennessee, but after 1810 Georgia, Alabama, Mississippi, Louisiana and Texas of the Deep South received the most slaves. This is where cotton became king. Kentucky and Tennessee joined the slave exporting states.
By 1815, the domestic slave trade had become a major economic activity in the United States; it lasted until the 1860s. Between 1830 and 1840 nearly 250,000 slaves were taken across state lines. In the 1850s more than 193,000 were transported, and historians estimate nearly one million in total took part in the forced migration of this new Middle Passage.
By 1860 the slave population in the United States had reached 4 million, and black slave labor from the American South was providing two-thirds of the world's supply of cotton, and up to 80% of the crucial British market. The cotton gin thus "transformed cotton as a crop and the American South into the globe's first agricultural powerhouse"
Of all 1,515,605 free families in the fifteen slave states in 1860, nearly 400,000 held slaves (roughly one in four, or 25%), amounting to 8% of all American families.
Ashley's Sack is a cloth that recounts a slave sale separating a mother and her daughter. The sack belonged to a nine-year-old girl Ashley which was a parting gift from her mother, Rose, after Ashley had been sold. Rose filled the sack with a dress, braid of her hair, pecans, and "my love always"
The historian Ira Berlin in Generations of Captivity: A History of African American Slaves (2003), called this forced migration of slaves the "Second Middle Passage", because it reproduced many of the same horrors as the Middle Passage (the name given to the transportation of slaves from Africa to North America). These sales of slaves broke up many families and caused much hardship. Characterizing it as the "central event" in the life of a slave between the American Revolution and the Civil War, Berlin wrote that whether slaves were directly uprooted or lived in fear that they or their families would be involuntarily moved, "the massive deportation traumatized black people, both slave and free." Individuals lost their connection to families and clans. Added to the earlier colonists combining slaves from different tribes, many ethnic Africans lost their knowledge of varying tribal origins in Africa. Most were descended from families who had been in the United States for many generations.
"River" was a literal reference to the Mississippi or Ohio rivers. For much of the first half of the 19th century, Louisville, Ky., was one of the largest slave-trading marketplaces in the country. Slaves would be taken to Louisville to be "sold down the river" and transported to the cotton plantations in states further south.
In his 2010 history of the Mississippi River, Wicked River: The Mississippi When It Last Ran Wild journalist Lee Sandlin said "the threat of being 'sold down the river' was seen as tantamount to a death sentence."
In the 1840s, almost 300,000 slaves were transported, with Alabama and Mississippi receiving 100,000 each. During each decade between 1810 and 1860, at least 100,000 slaves were moved from their state of origin. In the final decade before the Civil War, 250,000 were moved. Michael Tadman wrote in Speculators and Slaves: Masters, Traders, and Slaves in the Old South (1989) that 60–70% of inter-regional migrations were the result of the sale of slaves. In 1820 a child in the Upper South had a 30% chance of being sold south by 1860. The death rate for the slaves on their way to their new destination across the American South was less than that suffered by captives shipped across the Atlantic Ocean, but mortality was higher than the normal death rate.
Slave traders transported two-thirds of the slaves who moved west. Only a minority moved with their families and existing master. Slave traders had little interest in purchasing or transporting intact slave families; in the early years, planters demanded only the young male slaves needed for heavy labor. Later, in the interest of creating a "self-reproducing labor force", planters purchased nearly equal numbers of men and women. Berlin wrote:
The internal slave trade became the largest enterprise in the South outside the plantation itself, and probably the most advanced in its employment of modern transportation, finance, and publicity. The slave trade industry developed its own unique language, with terms such as "prime hands, bucks, breeding wenches, and "fancy girls" coming into common use.The expansion of the interstate slave trade contributed to the "economic revival of once depressed seaboard states" as demand accelerated the value of slaves who were subject to sale.
Some traders moved their "chattels" by sea, with Norfolk to New Orleans being the most common route, but most slaves were forced to walk overland. Others were shipped downriver from such markets as Louisville on the Ohio River, and Natchez on the Mississippi. Traders created regular migration routes served by a network of slave pens, yards, and warehouses needed as temporary housing for the slaves. In addition, other vendors provided clothes, food, and supplies for slaves. As the trek advanced, some slaves were sold and new ones purchased. Berlin concluded, "In all, the slave trade, with its hubs and regional centers, its spurs and circuits, reached into every cranny of southern society. Few southerners, black or white, were untouched."
Once the trip ended, slaves faced a life on the frontier significantly different from most labor in the Upper South. Clearing trees and starting crops on virgin fields was harsh and backbreaking work. A combination of inadequate nutrition, bad water, and exhaustion from both the journey and the work weakened the newly arrived slaves and produced casualties. New plantations were located at rivers' edges for ease of transportation and travel. Mosquitoes and other environmental challenges spread disease, which took the lives of many slaves. They had acquired only limited immunities to lowland diseases in their previous homes. The death rate was so high that, in the first few years of hewing a plantation out of the wilderness, some planters preferred whenever possible to use rented slaves rather than their own.
The harsh conditions on the frontier increased slave resistance and led owners and overseers to rely on violence for control. Many of the slaves were new to cotton fields and unaccustomed to the "sunrise-to-sunset gang labor" required by their new life. Slaves were driven much harder than when they had been in growing tobacco or wheat back east. Slaves had less time and opportunity to improve the quality of their lives by raising their own livestock or tending vegetable gardens, for either their own consumption or trade, as they could in the east.
Because of its inadvertent effect on American slavery, and on its ensuring that the South's economy developed in the direction of plantation-based agriculture (while encouraging the growth of the textile industry elsewhere, such as in the North), the invention of the cotton gin is frequently cited as one of the indirect causes of the American Civil War.
A consequence in England of the American civil war was a period of great poverty in the hinterland of Lancashire where the prime industry was cotton processing and weaving. The Lancashire mills used mainly southern American cotton. The whole region was reduced to starvation levels affecting over half a million people. Cotton was eventually sourced elsewhere in the world, however the lead time was lengthy and never closed the gap.
