The concept of sovereignty as a rule of the international system has been in place since

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The concept of sovereignty as a rule of the international system was formalized in the Peace of Westphalia in 1648. This treaty ended the Thirty Years' War in Europe and established the principle of territorial integrity and non-interference in the internal affairs of other states. This idea of sovereignty became a cornerstone of the modern international system.

The Concept of Sovereignty as a Rule of the International