The section of the Compromise of 1850 that fueled more tensions between the North and South was regarding the fugitive slave act.
This act made it a federal law that Northerners who encounter slaves that escaped from the South must help in returning this slave to their owner in the South. This essentially made it so that Northerners had to help Southern plantation owners retain their slaves. Many Northerners hated this part of the Compromise of 1850, as it went against the morals of thousands of people in the North who were in favor of getting rid of slavery.
