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Francis is assassinated by a Serbian-backed terrorist group. This action arguably led to WWI
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Austria-Hungary, angered by the assasination of Franz Ferdinand, delcares war on Serbia. This eventually plunges into WWI
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Germany declares war on Russia after they start mobilizing for war. This brings a big player in military into the field.
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Germany declares total war on France. This brings in France's ally, Russia into WWI, as well was Great Britain some time later.
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Germany goes through Belgium killing and pillaging its people. This brings Great Britain into the war as they had an alliance with Belgium.
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The U-boats sink an ocean cruise liner, killing over a hundred Americans. This outraged civillians in America, calling for war.
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Germany says they will destroy any ship within their "restricted zone". They accomplsihed this using their U-boats.
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The Zimmermann note is interepted and decoded in Britain. This leads to an outcry for war in America.
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The bill to delcare war was suggested on April 2nd, and passed on April 6th. This formally brought the US into the war.
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Lenin overthrows the Bolsheviks and declares himself ruler. He sets up a communist government.
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Russia signs this treaty with the Central Powers. Russia left the war earlier than the other allies.
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The government passes the sedition act, which allowed the government to supress the freedom of spech if it was to criticise the government or the war effort. If this was in violation of the bill of rights is still a hot topic.
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Germany agrees to the terms set by the League of Nations. This was the offical ending to WWI
