What treaty is recognized as the most important step in achieving state autonomy and sovereignty in Europe?

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The Treaty of Westphalia, signed in 1648, marked the end of the Thirty Years' War and the beginning of a new era in European politics. It is recognized as the most important step in achieving state autonomy and sovereignty in Europe because it established the principle of the sovereignty of states and the right to self-determination. It also led to the recognition of the modern system of nation-states in Europe, laying the foundation for the European state system that has existed since.

What Treaty Is Recognized as the Most Important Step in Achieving