How did the principle of national self-determination shape political boundaries after World War I?

Following World War I, the principle of national self-determination served as a primary, albeit complex, guide for redrawing the political map of Europe and the Balkans. Championed by U.S. President Woodrow Wilson in his Fourteen Points, the goal was to foster peace and democracy by aligning state frontiers with the boundaries of ethnic, linguistic, and cultural groups.123

This approach led to the dissolution of the Austro-Hungarian Empire and the creation or restoration of sovereign states, including Poland, Czechoslovakia, and Yugoslavia. However, the practical application of this principle proved highly problematic. Central and eastern Europe contained a "jumble of peoples" with overlapping claims, making it impossible to create perfectly homogeneous nation-states.43

Consequently, the new borders often left significant national minorities within these states, such as the Sudeten Germans in Czechoslovakia or Magyars in Romania. This "Balkanization" of the region frequently created new political disputes and ethnic tensions rather than resolving them, ultimately contributing to the instability that characterized the interwar period.43