The economy of the Northern States in the USA was not dependent on plantations. Their economy as industry-based. Therefore they did not have to rely on slavery. They said that slavery is anti-human and demanded its abolition. During the 1861-65 period, there was a civil war between the Southern States which wanted to retain slavery and the Northern States which wanted to abolish slavery. The Northern States had the victory. Slavery was abolished. But only in the 20 century did the African Americans get their civil rights and the discrimination between the Blacks and Whites end.