WW1 Puzzle

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Across
  1. 7. The Austrian leader whose assassination sparked World War I
  2. 10. A secret message from Germany encouraging Mexico to attack the United States
  3. 12. The WW1 alliance of countries that included Germany, Austria-Hungary and Turkey
  4. 13. German submarines used to attack ships
  5. 14. Agreements between countries to support each other in war
  6. 16. The WW1 alliance of countries that included Britain, France, Russia, Italy and USA
  7. 17. The belief that building a strong military is the best way to protect and expand a country
  8. 18. Information spread to influence public opinion and support the war
  9. 19. The alliance of countries prior to the war that included Britain, France and Russia
  10. 20. An agreement to stop fighting, ending World War I
  11. 21. A type of fighting where soldiers battle from deep ditches
  12. 22. Payments demanded from Germany for war damages
  13. 23. The alliance of countries prior to the war that included Germany, Austria-Hungary and Italy
Down
  1. 1. A system where people are required to join the military
  2. 2. The man who assassinated Franz Ferdinand
  3. 3. The peace treaty that officially ended World War I was signed here
  4. 4. An armored vehicle introduced to break through enemy lines
  5. 5. A weapon that fires many bullets rapidly and caused heavy casualties
  6. 6. When a country takes over weaker regions to gain power and resources
  7. 8. A chemical weapon used to harm or kill enemy soldiers
  8. 9. Strong pride in one’s country that can lead to conflict with others
  9. 11. A situation where neither side can win or advance
  10. 15. A passenger ship sunk by Germany that angered Americans
  11. 16. The act of killing an important person for political reasons