I seem to remember a few states trying this about 150 years ago and got the shit kicked out of them for trying it. Was a total disaster, not to mention that the minute they started printing their own money, it became worthless pretty fast.
Keep the dollar as the medium of exchange... don't take on the Fed's army with your National Guard, not that complicated... Arizona has already seceded from the Welfare State philosophically, try and get some welfare there, forget it, that is the reason San Bernardino is such a welfare hole and home to many outlaw biker gangs, highway 40 goes from Texas to California and dumps off the welfare folk in San Berdoo...
We do NOT allow states to leave the union,,neither texas nor arizona are allowed to leave the union,,period , end of story, if people decide to leave the USA well there allowed to do that.
Letting the feds stick their nose in the public schools opened a Pandora's box. Next comes infringement of the 1st and 2nd Amendments and the list goes on. Exercise of the 10th Amendment is called for under these predatory actions, but not outright secession. And remember this is not just a Southern issue anymore as some of you like to recite ad nauseum. Look at new Hampshire and others.
the problem is...........they have gotten to the point where they think we owe them. Jefferson said government is to serve the people. I am afraid we are in the process of losing that.