Another way of looking at the future impact of a NAU on our national sovereignty is to examine what examined with the failed acceptance of the EU Constitution. From everything I can gather, it looks like the people some countries were vehemently opposed to an all encompassing Constitution because it would create a new superstate gov't that would have a great impact on how each country is governed because the new apparatus would most likely have the power to override the wishes of individual states.
If we join this new NAU, it's very conceivable that our God given Constitutional as well as legal protections would be sacrificed on the altar of the new superstate gov't. It would be insane to forfeit all of that in order to make a few bankers, retailers and crooked politicans richer than they are already.
Don't worry. I will be emperor of the new North American Union. Emperor Amishdude I.
Sic semper tyrannosaurus.
I will be ruthless but fair.
But mostly ruthless.