World War 1

4. The alliance of countries including Germany, Austria-Hungary, and the Ottoman Empire
7. The secret communication from Germany proposing a military alliance with Mexico
8. The major offensive led by General Pershing in 1918 that helped turn the tide in favor of the Allies
12. The treaty that ended WWI in 1919
14. The name of the British passenger ship sunk by a German U-boat in 1915

1. The organization that was responsible for assassinating Archduke Franz Ferdinand of the Austro-Hungarian Empire
2. The battle that marked the U.S. troops' first major engagement in WWI, fought in 1918.
3. The U.S. president during World War I
5. The battle in 1916 known for its massive scale and heavy casualties; it took place in France.
6. The name for the intense competition for colonies and military power leading up to the war
9. The primary gas used in chemical warfare during WWI
10. The main type of warfare characterized by trench systems
11. Commander of the U.S. military expeditionary force sent to Europe in 1917, known as the AEF.
13. The term for the war strategy involving rapid attacks and mobility, especially used in the later stages of the war