Northeners did not like the way that southerner people treated African Americans AND in the north they were mostly manufacturing companies so they didn't need slaves...southerners farmed and needed...
As the debate intensified, both sides brought religion into it - the North declaring slavery to be a sin against humanity, the South identifying it as a perfect God-given arrangement of man and...
Northerners came to view slavery as the very antithesis of the good society, as well as a threat to their own fundamental values and interests. South didnt like the idea