Slavery was not an easy concept to agree on because the North and the South had such strong feelings against one another. Two examples in which the compromise of slavery was opposed was the Compromise of 1850 and the Kansas-Nebraska Act. The main compromise that was disliked in the Compromise of 1850 was the Fugitive Slave Law.
The Fugitive Slave Law stated that any marshal that did not arrest a fugitive slave could be fined. This was very much hated by the North. There were already laws about fugitive slaves but this just strengthened them and forced the North to agree and cooperate with slavery even if they did not want to. The North did not feel it was necessary to turn in fugitive slaves for they felt that slaves should be considered equal and forcing them back into the south would just spread slavery and therefore canceling out their beliefs. .
Congress passed the Kansas-Nebraska Act in 1854, regulating the territories of Kansas and Nebraska. By allowing the settlers in the territories to decide for themselves whether or not to permit slavery, the act upset the political balance between North and South established in 1820 by the Missouri Compromise. The Kansas-Nebraska Act helped to start the Civil War, and caused the rise of the Republican Party, which was dedicated to prohibiting slavery in the new territories. This upset the North because they did not like the idea of popular sovereignty. They felt that by granting the south the right to popular sovereignty it would upset the equal balance that was given in the constitution.
The North and the South disagreed heavily on the idea of slavery. The Compromise of 1850 and the Kansas-Nebraska Act are both prime examples in which moral arguments and political actions of those opposed to the spread of slavery took place. .