World War I

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Across
  1. 3. Created after WWI to ensure world peace.
  2. 4. A secret message from Germany to Mexico proposing an alliance if Mexico starts a war with the US
  3. 9. A system of trenches and fortifications on the Western Front during World War I.
  4. 13. The treaty that officially ended World War I in 1919.
  5. 15. Some countries were jealous of others because of this
  6. 16. The weapon, first used on a large scale during World War I, that introduced chemical warfare
  7. 18. A strong sense of pride for your country
  8. 19. The assassination of Archduke Franz Ferdinand occurred in this city, setting off the war.
Down
  1. 1. A truce was called on this holiday in 1914 and both sides stopped fighting
  2. 2. The practice of building up strong armed forces to prepare for war.
  3. 5. The alliance of France, Russia, and the United Kingdom during World War I.
  4. 6. Wilson's idea for ending the war peacefully.
  5. 7. The event that triggered the start of World War I in 1914.
  6. 8. The policy of avoiding involvement in foreign conflicts.
  7. 10. The U.S. President who proposed the "Fourteen Points" as a plan for peace after World War I.
  8. 11. The alliance of Germany, Austria-Hungary, and the Ottoman Empire during World War I.
  9. 12. The leader of Germany during World War I.
  10. 14. The ship that was famously sunk by a German submarine in 1915, leading to outrage in the United States.
  11. 17. Submarines used in World War I