Finally, in 1936, Justice Sutherland, speaking for the Court in United States _v._ Curtiss-Wright Corporation, with World War I a still recent memory, took over bodily counsel's argument of 140 years earlier, and elevated it to the head of the column of authoritative constitutional doctrine. He said: A political society cannot endure without a supreme will somewhere. Sovereignty is never held in suspense. When, therefore, the external sovereignty of Great Britain in respect of the colonies ceased, it immediately passed to the Union.... It results that the investment of the Federal government with the powers of external sovereignty did not depend upon the affirmative grants of the Constitution. The powers to declare and wage war, to conclude peace, to make treaties, to maintain diplomatic relations with other sovereignties, if they had never been mentioned in the Constitution, would have vested in the Federal government as a necessary concomitant of nationality.[27] In short, the power of the National Government in the field of international relationship is not simply a complexus of particular enumerated powers; it is an inherent power, one which is attributable to the National Government on the ground solely of its belonging to the American People as a sovereign political entity at International Law. In that field the principle of Federalism no longer holds, if it ever did.[28] II The Separation of Powers The second great structural principle of American Constitutional Law is supplied by the doctrine of the Separation of Powers. The notion of three distinct functions of government approximating what we today term the legislative, the executive, and the judicial, is set forth in Aristotle's Politics,[29] but it was the celebrated Montesquieu who, by joining the idea to the notion of a "mixed constitution" of "checks and balances", in Book XI of his Spirit of the Laws, brought Aristotle's discovery to the service of the rising libertarianism of the eighteenth century. It was Montesquieu's fundamental contention that "men entrusted with power tend to abuse it". Hence it was desirable to divide the powers of government, first, in order to keep to a minimum the powers lodged in any single organ of government; secondly, in order to be able to oppose organ to organ.