Yah well you've already provided the qualifier. Where's the enforcement?
America -- a great idea, didn't last.
I’m not quite that cynical but Franklin did say on the last day of the constitutional convention,
In these sentiments, sir, I agree to this Constitution with all its faults—if they are such—because I think a general government necessary for us, and there is no form of government but what may be a blessing to the people if well administered; and I believe, further, that this is likely to be well administered for a course of years, and can only end in despotism, as other forms have done before it, when the people shall become so corrupted as to need despotic government, being incapable of any other.
I think we have a chance for the next few years to get things right but if we allow ourselves to be corrupted or discouraged, it will end in tyranny as Franklin predicted.