In 1648, European countries signed the Treaty of Westphalia that

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The Treaty of Westphalia ended the Thirty Years' War, a conflict between Catholic and Protestant countries in Europe. It established the principle of territorial sovereignty, which gave each country the right to govern their own territory without interference from outside powers. This treaty marked the beginning of the modern system of international relations in Europe.

In 1648, European Countries Signed the Treaty of Westphalia That