I don't know enough about other political systems to say whether the U.S. is the only one that draws this distinction between "political truth" and its formal expression. However, I do know that the entire project of the left is founded upon denying this distinction.
What I'm talking about is the distinction between the Declaration of Independence and the Constitution, the former expressing universal truth -- the essence -- the latter defining its particular political expression. The essence goes to the nature of reality, AKA the Laws of Nature and of Nature's God.
The essence of the Declaration is situated "above" the form of Constitution. It expresses the atemporal and universal truths "that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."
But these essential truths need a form, hence the Constitution. The Founders even say so: "to secure these [essential] rights, Governments are instituted among Men, deriving their just powers from the consent of the governed." Which leads to the necessary corollary that when the form fails to uphold the essence, then the form is no longer binding, and we're outta here:
[W]henever any Form of Government becomes destructive of these [essential] ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such [anterior and universal] principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.
The most articulate defender of this view was Abraham Lincoln (cf. the Koon Klassic A New Birth of Freedom). In this regard, you will notice that the civil war we are currently experiencing is the same old civil war that has been going on since the founding, and indeed, since the dawn of man. It is none other than the war between essence and form. It is Genesis 3 All Over Again.
The left of course wants to have its crock and force us to eat it too. Its guiding principle is that Truth Doesn't Exist and We are its Prophets. Or better, Enforcers.
For example, there is no such thing as human nature but women have an absolute right to a dead baby. Or, marriage is just a piece of paper but homosexuals are deprived of the dignity owed human beings without it. The list is pretty much endless. We're especially seeing the drama play out with regard to freedom of speech, about which the left is no longer even trying to conceal its deadly hostility.
Think of the Dred Scott decision: "the language used in the Declaration of Independence" demonstrates that blacks are not "intended to be included in the general words used in that memorable instrument." Oh really? Tell us more: blacks don't even have so much as a single right to which "the white man [is] bound to respect."
Notice the sleight of hand, as Taney even attempts to root this lie in a universal truth that is above the Constitution: this notion of cosmic inequality is "fixed and universal in the civilized portion of the white race," "an axiom in morals as well as in politics" which no one would ever think of disputing. No one! Welcome to the oppressive world of Political Correctness, 19th century version.
The leftist error of a "living Constitution" isn't the only possible cosmic bainfart here. There are also good conservative judges who only consider the "four corners" of the Constitution, without reference to the Declaration. In other words, they reject the natural rights theory of the Founders, and regard the Constitution as self-sufficient.
But nothing outside God is self-sufficient, and any attempt to render it so will inevitably become brittle and sclerotic. Yes the Constitution is ALIVE!, but only so long as it is rooted in the deathless truths of the Declaration. If the Constitution empowers the hands of the state, it is only because there is a Mind posited in the Declaration. If there is no Mind anterior to them, then the hands just grab Power with no limiting principle.
We're only dealing with the Big Picture today, without getting down into the weeds. But it also occurs to me that the Declaration is about Absoluteness, while the Constitution is necessarily relative -- i.e., relative the absolute truth of the Declaration.
This leads to another trick of the left: deny the absoluteness of the Declaration in order to re-situate it in constitutional law. Indeed, all of their malign constitutional mischief takes this form.
Marriage, for example, is a natural right which is anterior to the state, and which the state can only defend, not create. Nevertheless, homosexual marriage was conjured by the state on June 26, 2015. Which means the state has brazenly undermined a natural right for which reason it exists to defend in the first place. In other words, the state loudly proclaimed a rejection of its reason for being.
More generally, the natural law traditionalist has no rights to which the liberal elitist is bound to respect.
Now, governments long established should not be changed for light and transient causes. But the left's assault on the Laws of Nature and Nature's God isn't very light; pretty heavy-handed, rather. And if it is permanent, then we're outta here.
Liberalism faltered when it turned out it could not cope with truth.... The liberal project began to fail when it began to lie. That was the mid-sixties… the rot set in and has continued since. --Daniel Patrick Moynihan: