How did the Peace of Westphalia mark a turning point in European history?

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The Peace of Westphalia marked the end of the Thirty Years' War and brought an end to large-scale armed conflicts over religious faith in Europe. It established the principle of territorial sovereignty, which became the foundation of the modern international system, and paved the way for the development of secular nation-states. While religious toleration was granted in some areas, it was not adopted throughout the Holy Roman Empire, and the unification of German lands did not occur until much later. Central Europe did see economic growth following the peace, but this was not the defining characteristic of the treaty.

How Did the Peace of Westphalia Mark a Turning Point