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Franz Ferdinand Assassination
The assassination of Archduke Franz Ferdinand instigated the beginning of World War I. He was assassinated by Gavrilo Princep -
Austria-Hungary declares war on Serbia
Austria-Hungary declared war on Serbia because they claimed that Serbia was behind the assassination of the Archduke. -
First use of gas as a weapon by the Germans
The Germans used poison gas bombs to shoot behind enemy lines. The most common gases used were mustard gas, tear gas, or phosgene. -
Sinking of the Lusitania
The Lusitania was sunk on May 7, 1915 by a German U-Boat off the coast of Ireland. The Lusitania was cruise liner that was carrying a couple and their child to New York. -
Wilson reelected; pledged American neutrality
Wilson was reelected in 1916 and entered the United States into the war and ended American Neutrality. -
Zimmerman Note
A telegram sent to Mexico by German foreign minister, Arthur Zimmerman. This offered an alliance with Mexico in the event that the United States joined the war. This message was intercepted by Britain and presented to President Wilson. -
U.S. declares war
The United States officially enter the war and join the Allies on April 6, 1917. There were many causes that made the Americans join the war such as the Zimmerman Note and the sinking of ships by the Germans. -
Bolsheviks led by Lenin overthrow Russian government
The overthrowing of the Russian government held by the czar changed the Russian government from an autocracy to a more democratic government. -
War ends
Because of the Treaty of Versailles, Germany agrees to act in good faith and leave the Allies alone. This therefore ends the war. -
Treaty of Versailles
Was signed by the Allies and Germany on June 28, 1919 which said that Germany had to take full responsibility for any conflict that had happened, give the Allies billions of dollars, disarm all soldiers, and turn over big portions of land to the Allies.
