Whining about States rights to enslave people is certainly a take.

Particularly when in context, the war was caused by the South acting to usurp abolition in the North via the legal system (i.e. Dredd Scott https://en.wikipedia.org/wiki/Dred_Scott)

The importance and applicability of "states rights" is always oddly narrow.

    The importance and applicability of "states rights" is always oddly narrow.

It's also always ignoring the declarations of secession that all explicitly name slavery as the motivation.

The Confederate Constitution was mostly a copy of the US Constitution. One place where it differed is that it forbade any state from abolishing slavery. So the whole "states' rights" thing is obvious baloney.