Final answer:
Economic instability, political disillusionment, and nationalism collaborated to create conditions ripe for totalitarian regimes in Germany and Japan, leading to the rise of authoritarian leadership that promised national recovery.
Step-by-step explanation:
Economic instability, political disillusionment, and nationalism fostered conditions that led to the rise of totalitarian regimes in both Germany and Japan. In Germany, the terms of the Treaty of Versailles spawned deep resentment and this, alongside the severe economic troubles and political fragmentation of the 1920s, allowed Adolf Hitler's Nazi Party to emerge and exploit the situation by promoting an anti-Communist, nationalist agenda. Political disillusionment grew as democratic institutions seemed incapable of addressing these economic and social crises, paving the way for the totalitarian solutions that the Nazi Party offered.
In Japan, the rise of militarism and nationalism were paralleled by similar economic and political challenges. The global economic downturn after the Great Depression exacerbated these conditions, and Japanese militarists, espousing a destiny of regional dominance akin to the ideologies of Nazi Germany, seized control, subverting the democratic government. These elements combined led to the authoritarian and expansionist policies that escalated into World War II.