The primary reason why Quakers and other religious leaders in the North opposed slavery is that they believed it was a sin for one person to own another person. Quakers believed in equality and the inherent worth of every individual, regardless of race or ethnicity. They viewed slavery as a violation of these fundamental beliefs and were committed to ending it. Other religious leaders, such as the Puritans, also opposed slavery on moral grounds and recognized its inherent injustice.
