"All nations are under a strict obligation to cultivate justice toward each other, to observe it scrupulously and carefully, to abstain from anything that may violate it. ***
"The right of refusing to submit to injustice, of resisting injustice by force if necessary, is part of the law of nature, and as such recognized by the law of nations.
"In vain would Nature give us a right to refuse submitting to injustice, in vain would she oblige others to be just in their dealings with us, if we could not lawfully make use of force when they refused to discharge this duty. The just would lie at the mercy of avarice and injustice, and all their rights would soon become useless. From the foregoing right arise, as two distinct branches, first, the right of a just defence, which belongs to every nation, or the right of making war against whoever attacks her and her rights; and this is the foundation of defensive war. Secondly, the right to obtain justice by force, if we cannot obtain it otherwise, or to pursue our right by force of arms. This is the foundation of offensive war."
Justice is pledged by men to each other by means of promises or contracts; what promises and contracts are between men, treaties are between nations.
President Woolsey says: "A contract is one of the highest acts of human free-will: it is the will binding itself in regard to the future, and surrendering its right to change a certain expressed intention, so that it becomes, morally and jurally, a wrong to act otherwise.
"National contracts are even more solemn and sacred than private ones, on account of the great interests involved; of the deliberateness with which the obligations are assumed; of the permanence and generality of the obligations, measured by the national life, and including thousands of particular cases; and of each nation's calling, under God, to be a teacher of right to all, within and without its borders."
Vattel says: "It is a settled point in natural law that he who has made a promise to any one has conferred upon him a real right to require the thing promised; and, consequently, that the breach of a perfect promise is a violation of another person's right, and as evidently an act of injustice as it would be to rob a man of his property. ***
"There would no longer be any security, no longer any commerce between mankind, if they did not think themselves obliged to keep faith with each other, and to perform their promises."
It is evident that the whole weight of the recognized and accepted law of nations is thrown on the side of justice between nation and nation, and is the recognized and accepted standard of the obligation involved in compacts between nation and nation.
We must look, then, among the accepted declarations of the law of nations for the just and incontrovertible measure of the shame of breaking national compacts, and of the wickedness of the nations that dare to do it.