The Great War began in this year.

This event caused Russia to withdraw from WW I.

This organization was setup right after WWI to help; nations settle disputes peacefully.

During WWI, Germany, Austria-Hungary, Ottoman Empire and Bulgaria were called this.

The United States adopted this policy during the early years of the war.

Archduke Franz Ferdinand was assassinated in this city.

He led the Russian government until his abdication in 1917.

This was the first U.S. civilian ship to be sunk by a German submarine.

The Zimmerman Note encouraged which country to attack the United States.

Bosnia-Herzegovina was part of this country.

This man led the Bolshevik party.

This was the site of the signing of the formal peace treaty with Germany.

The WWI alliance between England, France, and Russia was known by this name.

Germany's attack on this country provoked England to join the war.

He was a coauthor of the "Communist Manifesto."

The original name for Veterans Day.

Serbia and Bosnia were joined at the end of the war to form this country.

This Serbian nationalist fired the shot that "sparked" The Great War.

This major change in German policy contributed to the United States entering the war.

President Wilson took this plan to the peace negotiation.

This form of warfare caused soldiers to stand, eat, sleep, fight, and die in miserable ditches.

This act contributed to the fear of immigrants and questioned the loyalty of some Americans.