The primary reason that Quakers and other religious leaders in the North opposed slavery was:
- They believed it was a sin for one person to own another person.
Quakers, in particular, held strong ethical and moral beliefs rooted in the idea of equality and the inherent dignity of all individuals. Many religious leaders viewed slavery as incompatible with their faith and teachings about justice, compassion, and the inherent worth of every person. While some of the other options may have had some influence, the core belief in the immorality of slavery was the driving factor in their opposition.