11) In what year did Nazi Germany begin the invasion of Poland?
12) What island was the site of the Battle of Okinawa, the last battle of WWII in the Pacific?
13) What was the code name for the Allied invasion of France on June 6, 1944?
14) What was the main cause of World War II?
15) Who was the supreme commander of the Allied forces during World War II?
16) When did the United States enter World War II?
17) Which countries formed the Axis Powers during World War II?
18) What name was given to the invasion of Poland by Germany in 1939?
19) How many atomic bombs were used in World War II?
20) Who wrote "Mein Kampf"?