Peace of Westphalia
The Peace of Westphalia ended the Thirty Years War and founded the modern nation-state system
October 24, 1648
Europe's Most Destructive Early Conflict
The Thirty Years' War was a series of devastating conflicts that tore through central Europe from 1618 to 1648. It began as a religious dispute between Catholic and Protestant states within the Holy Roman Empire and grew into a broad European power struggle involving France, Sweden, Spain, Denmark, and many smaller states. The war caused catastrophic destruction, particularly in the German lands at the heart of the fighting. Population estimates suggest that some regions lost a third or more of their inhabitants to violence, famine, and disease. Entire towns were destroyed and never rebuilt. The war is remembered as one of the most destructive conflicts in European history before the 20th century.
The Peace of Westphalia
The war ended with the Peace of Westphalia, a series of treaties signed in the German cities of Osnabrück and Münster on October 24, 1648. The negotiations had been ongoing since 1644 and involved representatives from most European states in one of the first examples of a broad multilateral diplomatic congress. The treaties recognized the sovereignty of the states of the Holy Roman Empire and their right to determine their own religious affairs. The independence of the Dutch Republic from Spain was formally recognized. France gained territory along the Rhine. Sweden gained territories in northern Germany. The treaties significantly weakened the authority of the Holy Roman Emperor over the German princes.
A Foundation for Modern International Relations
The Peace of Westphalia is often cited by scholars as a foundational moment in the development of the modern international system. The principle that states are sovereign within their own borders and that other states should not interfere in their internal affairs is sometimes called the "Westphalian system." While historians debate how much of this system actually originated in 1648, the treaties did establish important norms about the rights of states and the importance of negotiated settlements to end major conflicts. The framework created at Westphalia influenced European diplomacy for the following two centuries and helped shape the development of modern international law.