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The assassination of Archduke Franz Ferdinand of Austria-Hungary and his wife by a Serbian Nationalist is a great cause of WWI.
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The 1st World War starts when Austria-Hungary Declares war on Serbia.
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Russia joins the war because it has an alliance with Serbia and helps fight Austria-Hungary but Germany helps Austria-Hungary.
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France backed up Russia against Germany so both countries were fighting which made Britain declare war against Germany so Germany was the main enemy.
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An unofficial Christmas Truce is declared which rekindled the goodness in people.
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The Second Battle of Ypres begins. In this battle the Germans first use poison gas.
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The British ocean liner RMS Lustiana is sunk by a German U-boat U-20.
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The Battle of Verdun was the longest and bloodiest battle of World War I.
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The Battle of the Somme begins. Tanks are first introduced in this battle.
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The U.S. is forced to join the war due to Germany joining Mexico to fight the U.S.
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The treaty of Versailles officially ended World War I. Germany believed that they were cheated into signing the treaty which led to the rise of Nazi Germany during World War II.
