What significant treaty was signed between Charles V and the Schmalkaldic League in 1555?

The Peace of Augsburg, signed in 1555, was a pivotal treaty that addressed the religious tensions in the Holy Roman Empire during the Reformation. This treaty was significant because it allowed each prince within the Empire to determine whether Lutheranism or Roman Catholicism would be practiced in their territories, effectively granting a degree of religious autonomy.

This agreement marked a crucial moment in the acceptance of Protestantism and the recognition of religious plurality within the Empire, thus easing the ongoing conflicts between Catholic and Protestant states. It also established the principle of "cuius regio, eius religio" which translates to "whose realm, his religion," formalizing the division and coexistence of these faiths.

In contrast, the Treaty of Westphalia, the Peace of Paris, and the Treaty of Versailles addressed different issues, including the end of the Thirty Years' War, territorial disputes, and conditions following World War I, respectively. None of these treaties dealt directly with the religious divisions that the Peace of Augsburg specifically aimed to resolve during the Reformation period.