Aftermath of WW1 (and some other things)

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Across
  1. 6. The League of Nations believed that cooperation would result in collective...?
  2. 8. A cause that has an immediate affect
  3. 10. ANC stands for 'African National' what?
  4. 12. Which country entered both World Wars comparatively late?
  5. 15. The Western Front of WW1 was defined by what sort of warfare?
  6. 16. Imagery and wording designed to convince people of a certain belief
  7. 18. South African leader who fought against apartheid: Nelson who?
  8. 21. What system of government were Britain, France and Germany in WW1?
  9. 22. This region of Germany was demilitarised after WW1
  10. 23. Soviet leader with a massive moustache
  11. 24. Leader of the Nazis, had silly moustache
Down
  1. 1. The 14 Points for Peace were written by Woodrow who?
  2. 2. This multinational group was a __ of Nations
  3. 3. The system of segregation in South Africa, fought against by Nelson Mandela
  4. 4. British leader in WW2 who also came up with the idea for the Gallipoli campaign
  5. 5. The country whose invasion was a trigger cause for WW1
  6. 7. Which former empire was overthrown by Communists?
  7. 9. Poland and Latvia gained what after WW1?
  8. 11. Russia had to leave the war early because they were having a what?
  9. 13. What was the name given to Kiwi and Aussie soldiers in both world wars?
  10. 14. The location where peace terms with Germany were decided
  11. 17. Germany was barred from seeking alliance with what nation after WW1?
  12. 19. What was declared at 11 o'clock on the 11th November?
  13. 20. Germany, Austria and Turkey were what sort of powers in WW1?