Answer:
1. The Treaty of Versailles, signed after World War I, imposed harsh penalties on Germany, including significant territorial losses and reparations, which fueled German resentment and created the conditions for the rise of Naziism.
2. The failure of appeasement and the invasion of Poland by Nazi Germany in 1939 were critical triggers for the war, leading to the intervention of other world powers.
3. The global economic depression of the 1930s also played a significant role, as it created conditions of widespread poverty, unemployment, and desperation that enabled dictators like Hitler to rise to power and exploit people’s fears and grievances.