After the conclusion of the Thirty Years' War in 1648, what largely disappeared as a major cause of war among European states?

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The Thirty Years' War, which concluded with the Peace of Westphalia in 1648, was primarily fought over religious differences between Protestants and Catholics within the Holy Roman Empire and among European powers. After the war, religious conflicts significantly diminished as a major cause of war in Europe, as the treaties of Westphalia laid the groundwork for national sovereignty and the principle of cuius regio, eius religio, which allowed rulers to determine their countries' religions, thereby reducing religious conflict as a cause for wars.

After the Conclusion of the Thirty Years' War in 1648