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06/28/1914
Austro-Hungarian throne and his wife Sophie, Duchess of Hohenberg were assassinated in Sarajevo -
07/28/1914
Austria-Hungary declares war on Serbia, effectively beginning the First World War. -
08/4/1914
Great Britain declared war on Germany at 11:00 p.m. for violating Belgian neutrality. -
5/7/1915
the British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland. -
11/7/1915
France lost 48,320 casualties while Great Britain lost 61,713. -
1/19/1917
The British intercept a telegram sent by Alfred Zimmermann in the German Foreign Office to the German embassies in Washington, D.C., and Mexico City. -
4/6/1917
the United States formally declared war against Germany and entered the conflict in Europe. -
6/25/1917
The Nivelle Offensive in April and May had failed to achieve its more grandiose aims, had led to the demoralisation of French troops and confounded the Anglo-French strategy for 1917. -
11/11/1918
Although fighting continued elsewhere, the armistice between Germany and the Allies was the first step to ending World War I. -
6/28/1919
Germany and the Allies signed the Treaty of Versailles, formally ending World War I and providing for the creation of the League of Nations.