Example: South Carolina can announce that they are firing all their tax collectors and will not contribute to collecting the 47% tariff on imports. South Carolina cannot declare that there is no tariff in South Carolina and no one can collect it.
This would merely be the most extreme example of nullification. And it HAS happened historically, and even currently. Recently, Wyoming passed one of those "firearms freedom" laws and announced their intention to arrest any federal agent who attempted to enforce federal firearms regulations within Wyoming. Feds haven't tried their luck yet. Would be interesting to see who blinked if they did.
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SmartMuffin - Because anything less would be uncivilized - http://img.imgcake.com/smartmuffin/barkleyjpgde.jpg
http://dudewheresmyfreedom.com/