What discussed the so-called moral righteousness of the North?

The moral righteousness of the North, particularly during the American Civil War era, often revolved around the abolition of slavery and the promotion of civil rights. Northern abolitionists argued that the institution of slavery was a profound moral evil that contradicted the principles of liberty and equality. This belief was used to justify the Union's fight against the Confederacy, framing the conflict as a struggle for human rights and justice. Additionally, the North's stance was often contrasted with the South's defense of slavery, further emphasizing the North's self-perception as morally superior.