1) Several dictators rose to power in the 1930s in Germany, Italy, and Japan by promoting extreme nationalism and blaming ethnic or racial groups for their countries' problems.
2) Germany aggressively expanded its territory through the 1930s, violating the Treaty of Versailles, while Britain and France pursued a policy of appeasement.
3) In 1939, Germany and the Soviet Union signed a non-aggression pact, allowing Germany to invade Poland and marking the start of World War II. Germany quickly occupied much of Europe.
4) Japan also expanded its empire in Asia and the Pacific, culminating in its surprise attack on Pearl Harbor in 1941 that drew the United States into the war against Germany, Italy,