What laid the basis for the creation of the modern nation-state?

Question

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The Treaty of Westphalia in 1648 is widely considered to have laid the basis for the creation of the modern nation-state system. This treaty ended the Thirty Years' War and recognized the sovereignty of individual states, establishing the principle of territorial integrity and the right of a state to govern itself without interference from external powers. These principles formed the basis for the development of the modern nation-state system, in which a state's legitimacy and authority are tied to its territorial control and the loyalty of its citizens.

What Laid the Basis for the Creation of the Modern