WWII crossword puzzle

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Across
  1. 1. Cause of Hitler's death
  2. 3. US president after the war
  3. 6. Great Britain, US, France, Russia
  4. 7. Mass genocide of the Jewish people
  5. 9. What was the event that led the US to join WWII?
  6. 11. Churchill Prime Minister during the Battle of Britain
  7. 12. Who was the leader of fascist Italy?
Down
  1. 2. Leader of the free France
  2. 4. Duce Mussolini's nickname
  3. 5. US president at the beginning of the war
  4. 8. Leader of Russia
  5. 10. What forced Japan to surrender?