"At the time of the American Revolution, fewer than 10 percent of the half million slaves in the thirteen colonies resided in the North, working primarily in agriculture.... Most of the original Northern colonies implemented a process of gradual emancipation in the late-18th and early-19th centuries, requiring the children of slave mothers to remain in servitude for a set period, typically 28 years. Other regions above the Mason-Dixon line ended slavery upon statehood early in the nineteenth century- Ohio in 1803 & Indiana in 1816, for instance....Throughout colonial & antebellum history, U.S. slaves lived primarily in the South. Slaves comprised less than a tenth of the total Southern population in 1680 but grew to a third by 1790. At that date, 293,000 slaves lived in Virginia alone, making up 42 percent of all slaves in the U.S. at the time. South Carolina, North Carolina, & Maryland each had over 100,000 slaves. After the American Revolution, the Southern slave population exploded, reaching about 1.1 million in 1810 and over 3.9 million in 1860."-from "Slavery in the South," Jenny BourneBased on these sources, calls for the abolition of slavery in the early 1800s

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