The primary focus of the Peace of Westphalia in 1648 was to end the Thirty Years' War in Europe and establish a new framework for international relations and state sovereignty. This series of treaties marked a significant turning point in European diplomacy, emphasizing the principles of territorial integrity and the recognition of state boundaries. The Peace of Westphalia laid the foundation for the modern state system, diminishing the power of religious authorities in politics and advocating for the concept of state sovereignty. It initiated an era where nation-states would prioritize their interests and engage in diplomatic relations, thereby reshaping the political landscape of Europe.