Many Northerners were happy that free states now had more representatives in Congress. However, many were also upset with the Fugitive Slave law.
This law, that was part of the Compromise of 1850, made it so that any slave that escaped to the North must be returned to their owner in the South. Many northerners thought this was unfair and did not want to follow this law. This is because almost all northern states had outlawed slavery by this point and time.
