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The heir to the Austro-Hungarian throne was assassinated in Sarajevo by a Serbian nationalist group called The Black Hand. Austria Hungary then sent a referendum to Serbia, they did not comply. -
Austria Hungary declares war on Serbia which has an alliance with Russia, who is in the Entente. -
In solidarity with an alliance with Austria Hungary, the German Empire declares war on Russia and France and starts the Schlieffen Plan. -
Germany goes through with the schlieffen plan and goes through Belgium committing various war crimes which brings the British Empire into World War One. -
The German line was within 40 miles of Paris, and after several German attacks the Entente has stopped the Germans from advancing further specifically at the Battle of the Marne. The front became static with very little change. -
The Ottoman Empire joins the Central Powers supplying them with natural resources (Oil) that they otherwise wouldn't get due to a British Blockade -
With lands that Italy claimed in Austrian hands the Kingdom of Italy decided to sign the pact of London and declare war on the Central Powers -
With the sinking of the Lusitania and the interception of the Zimmerman note the US passed a joint resolution to declare war on Germany -
With the Russian Revolution in full swing the Russians decided that the war with the Germans couldn't be sustained and withdrew from the war -
After prolonged fighting and a failed counteroffensive the Germans realize the war cannot be won and agrees on an Armistice on Nov. 11 .1918. Later the Treaty of Versailles put harsh terms on Germany setting the stage for a radical change.