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Archduke Franz Ferdinand of Austria and his wife are assassinated in Saravejo by a Serbian nationalist

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World War 1 officially begins with with Austria-Hungary declaring war on Serbia

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Most of Europe and parts of Asia declare war on each other

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First Battle of the Marne and trench warfare

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Britain and France declare war on the Ottoman Empire

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Second Battle of Ypres. Germany begins using chemical warfare.

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The British ship, Lusitania, is sunk by German uboats.

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Battle of Verdun begins.

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German and British naval armies meet off the coast of Denmark in the only sea battle of the war

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The first Battle of the Somme begins. Bloodiest day in British history

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Tsar Nicholas abdicates his throne. Russian revolution begins

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The United States declares war on Germany. The Zimmerman telegraph was sent by the Germans to Mexico trying to forge an alliance with the Mexican government

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First ever tank battle

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Soviets form peace with the Central Powers at the Treaty of Brest-Litovsk

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War is officially over. The Treaty of Versailles is formed and signed