WW1 major project crossword puzzle

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Across
  1. 3. (Clue: Frustrations with foreign control led to violence)
  2. 6. (Clue: was stopped by france and the British at the battle of The marne)
  3. 8. (Clue: first full-scale offensive with the tank)
  4. 15. (Clue: A organization that tapped phone lines and plants spies)
  5. 18. (Clue: Central powers)
  6. 19. (Clue: Increased tension over territories)
  7. 22. (Clue: joined triple entente early)
  8. 23. (Clue: When japan opened its ports not for trade)
  9. 25. (Clue: Treaties to defend one another)
  10. 26. (Clue: Russia)
  11. 27. (Clue: The battle that stopped german advances)
  12. 29. (Clue: fought as a soldier but soon became a german dictator)
  13. 32. (Clue: Was the main person assassinated)
  14. 35. (Tanks came in the war around this battle)
  15. 37. (allied powers)
  16. 38. (Clue: a armored fighting vehicle intended as a primary offensive weapon in front-line ground)
  17. 39. (Clue: was offered an truce to germany)
  18. 40. (Clue: A german attack to frighten the french)
Down
  1. 1. (Clue: made by germany first
  2. 2. (Clue: A type of strategy used during WW1)
  3. 4. (Clue: AN abbreviation for Union of Soviet Socialist Republics)
  4. 5. (Clue: the world's second-largest and second-most populous continent)
  5. 7. (clue: an raid fire weapon)
  6. 9. (Clue: mainly war censorship)
  7. 10. (Clue: Headed by dynamic leader)
  8. 11. (Clue: Basically WW1)
  9. 12. (Clue: France)
  10. 13. (Clue: treaty that ended the first Opium War, the first of the unequal treaties between China and foreign imperialist powers.)
  11. 14. (Clue: a note from germany)
  12. 16. (Clue: The purpose of a Health Maintenance Organization is to focus on overall patient wellness and preventive healthcare while keeping costs low for its members by only covering in-network physicians and facilities)
  13. 17. (Clue: an event that killed 8-13 million)
  14. 20. (Clue: killed 1,198)
  15. 21. (Clue: 1914,1915,1917)
  16. 24. (Clue: Wanted land from austria hungary)
  17. 28. (Clue:German Submarine)
  18. 30. (Clue European nation agreed to it)
  19. 31. (Clue: Heavenly Kingdom of great peace)
  20. 33. (Clue: Turkey)
  21. 34. (Clue: Earth's largest and most populous continent)
  22. 36. (Clue: Two wars waged between the Qing dynasty and Western powers)