Is the treaty of Westphalia is key to understanding the origin of modern Europe and state system?

Yes, the Treaty of Westphalia, signed in 1648, is crucial for understanding the origins of modern Europe and the contemporary state system. It marked the end of the Thirty Years' War and established principles of national sovereignty and non-interference in the domestic affairs of states. This treaty laid the groundwork for the nation-state concept, emphasizing territorial integrity and political independence, which are fundamental to the current international order. Its legacy continues to influence diplomatic relations and international law today.