What was one effect of John Brown's raid?

One significant effect of John Brown's raid on Harpers Ferry in 1859 was the intensification of sectional tensions between the North and South. The raid alarmed Southern slaveholders, who feared that abolitionist movements could incite slave revolts, leading to a crackdown on abolitionist activities. In the North, while some viewed Brown as a martyr for the anti-slavery cause, others were unsettled by his violent methods, which further polarized public opinion on the issue of slavery. Ultimately, the raid foreshadowed the impending conflict that would erupt into the Civil War.