The Yankees sold their slaves South to the plantations and had no problem with buying cotton, tobacco, and other agricultural products produced with this system. While slavery may have been outlawed up north, many northern cities barred blacks from living, voting, or moving about freely.
No question about that (although my Yankee edumacashun made slavery into JUST a southern problem). When I tell my fellow Yankees that slavery wasn’t outlawed in NY until 1827, their mouths hang open.