African slaves were freed in the North American colonies as early as the 17th century. Some, such as
Anthony Johnson, went on to become landowners and slaveholders themselves. Slaves could sometimes arrange manumission by agreeing to "purchase themselves" by paying the master an agreed amount. Some masters demanded market rates; others set a lower amount in consideration of service.
Reytory Angola, herself a freed slave, was the first Black person to individually petition a legislature when she requested the manumission of her enslaved adopted son in
New Amsterdam in 1661. of the
Colony of Virginia, which freed him from slavery. Signed by his owner, David Miller. Regulation of manumission began in 1692, when Virginia established that to manumit a slave, a person must pay the cost for them to be transported out of the colony. A 1723 law stated that slaves may not "be set free upon any pretence whatsoever, except for some meritorious services to be adjudged and allowed by the governor and council". In some cases, a master who was drafted into the army would send a slave instead, with a promise of freedom if he survived the war. The new government of Virginia repealed the laws in 1782, and declared freedom for slaves who had fought for the colonies during the
American Revolutionary War of 1775–1783. Another law passed in 1782 permitted masters to free their slaves of their own accord. Previously, a manumission had required obtaining consent from the state legislature, an arduous process which was rarely successful. As the population of
free Negroes increased, the Virginia legislature passed laws forbidding them from moving into the state (1778), and requiring newly freed slaves to leave the Commonwealth within one year unless special permission was granted (1806). In the
Upper South in the late 18th century, planters had less need for slaves, as they switched from labour-intensive tobacco cultivation to mixed-crop farming. Slave states such as Virginia made it easier for slaveholders to free their slaves. From 1791 the Virginian
Robert Carter III (1728–1804) emancipated almost 500 slaves. In the two decades after the
American Revolutionary War, so many slaveholders accomplished manumissions by deed or in wills that the proportion of free black people to the total number of black people rose from less than 1% to 10% in the Upper South. In Virginia, the proportion of free black people increased from 1% in 1782 to 7% in 1800. Together with several
Northern states abolishing slavery during that period, the proportion of free black people nationally increased to ~14% of the total black population. New York and New Jersey adopted gradual abolition laws that kept the free children of slaves as indentured servants into their twenties. After the 1793 invention of the
cotton gin, which enabled the development of extensive new areas for cotton cultivation, the number of manumissions decreased because of increased demand for slave labour. In the 19th century, slave revolts such as the
Haitian Revolution of 1791–1804, and especially the 1831 rebellion led by
Nat Turner, increased slaveholders' fears. Most Southern states passed laws making manumission nearly impossible until the passage of the 1865
Thirteenth Amendment to the United States Constitution, which abolished slavery,
except as a punishment for crime, after the
American Civil War. In
South Carolina, to free a slave required permission of the
state legislature; Florida law prohibited manumission altogether. == Ottoman Empire ==