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June 28- Assassination of Archduke Franz Ferdinand of Austria
August 1 - Germany declares war on Russia.
August 2 Germany invades Luxembourg.
August 6 Austria-Hungary declares war on Russia. Serbia declares war on Germany.
August 23 Japan declares war on Germany.
October 16 France declares war on Bulgaria.
October 19 Italy and Russia declare war on Bulgaria.
April 6 The United States of America declares war on Germany.
January 18 Treaty of Versailles between the Allies and Germany: the Peace Conference opens in Paris.
June 28 Treaty of Versailles signed

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After the war, due to the war guilt provision, Germany was forced to take the complete responsibility of the war.
copying from wikipedia as it is...