The American civil war wasn’t about slavery.
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The easiest counter to the States’ Rights argument is “States’ Rights to do what?”.
The easiest way is to just show them each state's letter of secession. They were not shy about it. No need for a deep historical analysis, it's right there many times over in plain English.
Even today tbh. They never advocate for state's rights to make life better for people, only for oppression.