Which factors led to World War 2?

World War II was primarily caused by the rise of totalitarian regimes, particularly in Germany, Italy, and Japan, fueled by economic instability following the Great Depression. The Treaty of Versailles, which ended World War I, imposed harsh reparations on Germany, fostering resentment and nationalism. Additionally, the policy of appeasement adopted by Western powers allowed aggressive expansion by these regimes to go unchecked, ultimately leading to conflict as they invaded neighboring countries. The failure of the League of Nations to maintain peace also contributed to the escalation of tensions.