President of the United States during this time.
Who was Woodrow Wilson?
Many countries used system to get enough people to fight in the war.
Revolution that took place in Russia during the war.
What is the Russian (or Bolshevik) revolution?
This event later became one reason the U.S. decided to join the war.
What is the sinking of the Lusitania?
This individual led a revolution and then a civil war in Russia
Who is Lenin?
This refers to the idea of building up a country's defense system, like Britain and Germany did with their navies in the early 20th century.
What is militarism?
What Austria-Hungary sent to Serbia after the assassination in the summer of 1914.
What is an ultimatum?
The Germans used this weapon in an unrestricted way during part of the war.
What are u-boats?
After the war, many former German colonies and parts of the former Ottoman Empire became known as these.
What are mandates?