The "Thirty Years' Crisis" refers to the period from 1914 to 1945, marked by significant political, social, and economic upheaval in Europe and beyond. This era includes both World Wars, the rise of totalitarian regimes, and the Great Depression. The crisis highlighted the failures of the League of Nations and the challenges of maintaining peace in a rapidly changing world. During this time, various ideologies, such as fascism and communism, gained traction as nations struggled to recover from the devastation of war and economic instability. The crisis ultimately set the stage for the emergence of the Cold War and the reconfiguration of international relations in the post-war era.