<P> Westphalian sovereignty, or state sovereignty, is the principle of international law that each nation - state has exclusive sovereignty over its territory . External powers should not interfere in another country's domestic affairs . Each state, no matter how large or small, has equal rights to sovereignty . The principle underlies the modern international system of sovereign states . The United Nations Charter states that "nothing should authorise intervention in matters essentially within the domestic jurisdiction of any state ." </P> <P> The concept has been traced back to the Peace of Westphalia (1648), which ended the Thirty Years' War . The principle of non-interference was further developed in the 18th century . The Westphalian system reached its peak in the 19th and 20th centuries, as nation - states consolidated and European colonies gained their independence . </P>

The three pillars of the westphalian constitution of world politics are
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