“The national interest cannot be defined as a common interest of the industrial, commercial, and financial companies of a country, because there is no such common interest; nor can it be defined as the life, liberty, and well-being of the citizens, because they are continually being adjured to sacrifice their well-being, their liberty, and their lives to the national interest. In the end a study of modern history leads to the conclusion that the national interest of every State consists in its capacity to make war.”