The road to World War II was paved with political instability, economic turmoil, and the rise of extremist ideologies in Europe. The aftermath of World War I, including the harsh Treaty of Versailles, set the stage for future conflicts and resentments. The Great Depression of the 1930s further destabilized Europe, fueling the rise of fascism and Nazism. Failed diplomacy, appeasement policies, and aggressive expansionism by totalitarian regimes ultimately led to the outbreak of war in 1939.