Peace of Westphalia
Briefly

The Peace of Westphalia ended the Thirty Years’ War on October 24, 1648, granting political autonomy to small states in the Holy Roman Empire and allowing for religious freedom.
The treaties established Westphalian sovereignty, which asserts that all states, regardless of size or religious belief, have a right to self-governance, influencing modern international relations.
Read at World History Encyclopedia
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