This is from Lassa Oppenheim's International Law: A Treatise, Volume I, London 1905. I thought it might be of interest to show how International Law was changing around the American Civil War.
In light of the current discussions about the ability to get out of a treaty unilaterally, I'd like to draw particular attention to this part:
"In 1871 the Conference of London attended by the representatives of the Powers which were parties to the Peace of Paris of 1856 solemnly proclaims that it is an essential principle of the Law of Nations that no Power can liberate itself from the engagements of a treaty or modify the stipulations thereof unless with the consent of the contracting Powers by means of an amicable arrangement."
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