Generally speaking, Northerners and Northern politicians believed that slavery should not be allowed to expand to new territories or new states. Part of their argument was negated in 1857 by a ruling by the US Supreme Court which said slavery was constitutional.
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Beyond the moral implications, slavery was a threat to northern jobs. While the work of abolitionists was for human rights, many northerners believed slavery took away jobs from white workers and threatened the political system by giving slave states more power than they deserved based on the number of enslaved people they had.
a question of simple human values
On a personal point of view basis, Northern factory owners saw slavery as inhumane. However, for business purposes, they wanted to attract workers from the agricultural South to work in factories in the North.
he liked having slavery
. He argued against importation of slaves and motion the word 'slavery' be withheld from the constitution