None of those states were part of the CSA which was the Slaver Empire. Your history lesson was interesting but not at issue as none of the states left the Union. Since 100,000 from the CSA states fought for the Union by your logic those states were part of the Union still.
Opinion is what this discussion is about contrary to those who believe they can post a couple of quotations (or yards of them) and think they have proved something. I could post a quotation from God Almighty saying that everything I say is 100% true and you would not accept it anyway.
You are arbitrarily redefining the terms to suit your agenda. The geographic definition of the south is the Mason-Dixon line and always has been. Three border states on the southern side of the Mason-Dixon line had DIVIDED LOYALTIES in the war and simply do not fit neatly into either side of it. Missouri and Kentucky simultaneously had congressional delegations in both the Union AND Confederate congresses for that matter. From the fall of 1861 to the war's end Missouri even had two legislatures, two governors, and two sets of state officers, with the confederate one actually having the stronger claim to legitimacy as it was the government that was elected by Missouri in the 1860 election. Kentucky was the reverse with two governments, the rump one going confederate. Nor is it accurate to claim that any of these states stayed "loyal" as all three sent several units of soldiers to both armies. At times and in many places of those three states there was virtual anarchy during the war. Elsewhere there was pure heavy handed undemocratic despotism by whoever happened to control that region at that particular time.