World War I

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Across
  1. 6. This was the most deadly weapon used during World War I
  2. 9. Required men to register with the government to be selected for military service
  3. 10. muddy land with shell craters and barbed wire
  4. 13. A nickname for German Soldiers during WWI
  5. 14. The United States used this to overcome the threat of German U-Boats
  6. 15. Heir to the Austrian throne
  7. 17. The development of armed forces
Down
  1. 1. A devotion to the interests and cultures of one's own nation
  2. 2. President of the United States during WWI
  3. 3. This contained a suggestion of an alliance between Mexico and Germany
  4. 4. stronger nations extending control over weaker nations
  5. 5. Germany, Austria-Hungary, and Ottoman Empire
  6. 7. This type of warfare included airplanes and tanks
  7. 8. This form of warfare was used to protect against the machine gun
  8. 11. The policy that kept the United States out of war
  9. 12. The sinking of this ship began to sway American sentiment towards entering the war
  10. 16. Russia, France, and Britain