[TradicalRC]

The Northern states had eliminated slavery. That was the issue that brought on the war.

Missouri, Kentucky, Maryland and Delaware. Please read your history before making an assertion.

[muawiyah]

Those are the BORDER STATES. You are confounding "Union" with "Northern". They have different meanings, particular in Souvrn' where "northern" appears in the expression (erroneous btw) "War of Northern Aggression".

You will notice, also that Northern Virginia itself had a "rump" Union government, as did Arkansas ~ in fact, Arkansas had essentially two separate and functioning state governments during most of the Civil War.

That was the last time Arkansas had "any" functioning state government ~ since then it's been pretty much "Bill Clinton", one right after the other.

Louisiana also had a Union "military government" pretty early on when it was retaken by the Union.

So, the answer is that ALL Northern states had abolished slavery. Some border states retained slavery. All Souvrn' states had slavery, even when reclaimed by the Union.

Full abolition had to await a Constitutional amendment.

You have to treat the breakup of the Holy Roman Empire after Charlemagne's death pretty much the same way. It didn't turn into just France, and just Germany ~ there was another country in the middle stretching from Nederland to Sicily. I believe it was called Thurungia.