Five causes of world war 2

world wide economic depression, treaty of Versailles, failure of appeasement, rise of militarism in Japan and Germany, and the failure of the League of Nations

Some causes of World War II were the aggressive actions of Germany, Japan, and Italy and the German resentment caused by the Treaty of Versailles ... One major effect of World War II was the use of nuclear weapons in war, which would later lead to the Cold War.