  Kelsen’s answer to this question is surprisingly simple: an act or an event gains its legal-normative meaning by another legal norm that confers this normative meaning on it. An act can create or modify the law if it is created in accordance with another, “higher” legal norm that authorizes its creation in that way. And the “higher” legal norm, in turn, is legally valid if and only if it has been created in accord with yet another, “higher” norm that authorizes its enactment in that way. In other words: it is the law in the United States that the California legislature can enact certain types of laws. But what makes this the law? The California Constitution confers this power on the state legislature to enact laws within certain prescribed boundaries of content and jurisdiction. But then what makes the California Constitution legally valid? The answer is that the legal validity of the Constitution of California derives from an authorization granted by the US Constitution. What makes the US Constitution legally valid? Surely, not the fact that the US Constitution proclaims itself to be “the supreme law of the land”. Any document can say that, but only the particular document of the US Constitution is actually the supreme law in the United States.