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Updated: October 10, 2026
The crisis was intensified, first, by the repeal on the part of certain free States of their slave-sojournment laws; second, by the extraordinary activity of the underground railroad; third, by increasing opposition in the North to the execution of the Fugitive Slave law, all of which, acting together, seriously impaired the value and security of slave property in the Union; fourth, by that fierce, obstinate, but futile, struggle of the South to obtain possession of Kansas, and the exposure thereby of its marked inferiority as a colonizer in competition with modern industrialism; fifth, by the growing influence of the abolition movement, and, sixth, by those nameless terrors of slave insurrections, which were evoked by the apparition of John Brown at Harper's Ferry.