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In page Abolitionism in the United States:

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Some individual slaveholders, particularly in the upper South, freed slaves, sometimes in their wills. Many noted they had been moved by the revolutionary ideals of the equality of men. The number of free blacks as a proportion of the black population in the upper South increased from less than 1 percent to nearly 10 percent between 1790 and 1810 as a result of these actions. Some slave owners, concerned about the increase in free blacks, which they viewed as destabilizing, freed slaves on condition that they emigrate to Africa.[citation needed]