How did the Fugitive Slave Act of 1850 affect relations between the North and South?

The Fugitive Slave Act of 1850, part of the Compromise of 1850, significantly intensified sectional hostility between the North and the South. By denying fugitives the right to a jury trial and prohibiting them from testifying on their own behalf, the law forced Northern citizens to participate in the machinery of slavery, which many found morally abhorrent.1

In response, many Northern states enacted personal-liberty laws to protect escaped enslaved people and free Black residents, effectively obstructing the federal mandate. This resistance fueled the growth of the abolitionist movement and increased the efficiency of the Underground Railroad.12

Ultimately, the South viewed these Northern efforts to undermine the act as a violation of their rights. When South Carolina moved toward secession in 1860, it explicitly cited these Northern state laws as a primary grievance. The enforcement of the 1850 act proved so divisive that it became a major catalyst for the American Civil War, as it deepened the irreconcilable conflict over the morality and legality of human bondage.12