Archduke Franz Ferdinand - Leader of Austria-Hungary who was assassinated by a person from Serbia., Serbia - The country that Austria-Hungary declared war on in June of 1914, Allied Powers - Countries that helped France, Luxembourg, and Serbia during World War 1. These included Great Britain, Russia, Italy, and Spain., Central Powers - The countries that helped Austria-Hungary and Germany. These included Bulgaria and the Ottoman Empire, machine gun, tank, airplane, bomb, submarine, trench warfare, Lusitania - A British passenger ship that was shot by a German submarine. It is one of the reasons the USA joined World War 1, Zimmerman Telegram - A message from Germany to Mexico. It asked Mexico to help attack the United States of America. This was another reason the USA joined World War 1, Woodrow Wilson - President of the United States of America during World War 1, France and Germany - Most of the fighting was on the border of these two countries., November 11, 1918 - The day Germany signed the Armistice treaty, May 1917 - The USA goes to war against Germany., 18,000,000 - The number of people killed during World War 1.,

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