You misunderstand me. The ruling class in the north didn’t care about slavery, just their own profits. It just so happened that they were in competition with th

You misunderstand me. The ruling class in the north didn’t care about slavery, just their own profits. It just so happened that they were in competition with the ruling class in the south, whose wealth depended on slavery. Of course many workers did care about slavery and wanted to end it, so they allied themselves to the northern ruling class.