Which events contributed the MOST to the political instability that emerged in Europe in the years following World War 1?

The political instability in Europe following World War I was primarily driven by the harsh terms of the Treaty of Versailles, which created widespread resentment in Germany and contributed to the rise of extremist movements. The collapse of empires, such as the Austro-Hungarian and Ottoman Empires, led to nationalistic tensions and the emergence of new states, often marked by ethnic conflicts. Additionally, the economic turmoil of the 1920s, including hyperinflation in Germany and the Great Depression, exacerbated social unrest and weakened democratic governments, paving the way for authoritarian regimes.