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In page Abolitionism in the United States:

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Anti-slavery as a principle was far more than just the wish to prevent the expansion of slavery.[citation needed] After 1840, abolitionists rejected this because it let sin continue to exist; they demanded that slavery end everywhere, immediately and completely. John Brown was the only abolitionist to have actually planned a violent insurrection, though David Walker promoted the idea. The abolitionist movement was strengthened by the activities of free African Americans, especially in the Black church, who argued that the old Biblical justifications for slavery contradicted the New Testament.