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June 28
Archduke Franz Ferdinand is assassinated. -
July 28
Austria-Hungary declares war on Serbia. -
August 1
Germany declares war on Russia. -
August 3
Germany declares war on France. -
August 4
The United Kingdom declares war on Germany. -
August 6
Austria-Hungary declares war on Russia, and Serbia declares war on Germany. -
August 19
U.S. President Woodrow Wilson declares the U.S. will remain neutral. -
May 7
The British RMS Lusitania is sunk by Germany. -
1916
The Battle Of Somme begins. -
1917
Germany attempts to persuade Mexico to join the war. The British decode the message. -
1917
U.S. joins the war. -
1918
U.S. President Woodrow Wilson issues the Fourteen Points. -
1918
Germany signs the armistice, which stops the fighting. -
1919
The Treaty of Versailles officially ends the war.