nostr:npub1dux3je9tteg809hydapmhrjnrgaqh7x4f34wxj5xkhzdtftxupnsaqwjvy Yup, it was all the states that bordered the south but were in the north.

Though technically you could argue after the emancipation proclimation (since the north is the legal recognized government) the north was the only region left with slaves after that moment..

Of course the reality is more complex since southern states didnt recognize the authority. But at least from the perspective of the north, as the one true government, after that point slavery existed **only** in the north (legally).