Why is the Bible important for the U.S. or any nation who wants to be blessed of God?

Every ideology has some book they hold authoritative and from which they pull their moral justification for how they live. For evolutionists and humanists, it might be Darwin’s- Origin of the Species. For Nazis it is Hitler’s Mein Kampf. For islam it is the Koran and the Hadith. For Jews it is the OT and for Christians it is the OT and the NT – the Bible. Why is the Bible so important for the U.S. or any nation who wants to be blessed of God?