World War One Crossword

One cause of WWI was the build up of armies and weapons.
One cause of WWI was extreme pride in ones country.
One cause of WWI was when stronger countries taking over weaker countries politically and economically.
One cause of WWI was the system in which countries signed treaties agreeing to back each other if attacked by an enemy.
The spark that started WWI was the assassination of Franz Ferdinand of what country?
Who was the American president during WWI?
The first two years of the war ended in a what?
What was the most feared weapon during WWI?
Which side included the countries Germany, Austria-Hungary, Ottoman Empire and Bulgaria?
Which side included the countries of Great Britain, Russia, Belgium and France?
What did Americans purchase to help support the war effort on the homefront?
What could Americans plant to help feed soldiers in the war?
What country pulled out of the war due to a revolution in their own country?
What ship sank on May 7, 1914, that caused many Americans to want to join WWI?
What was sent by Germany to Mexico that angered the USA and caused them to move closer to WWI with Germany?
What country fired the shot that started WWI?