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Archduke Franz Ferdinand was murdered June 28, 1914, Sarajevo, Bosnia and Herzegovina. He was murdered by Gavrilo Princip a member of a Bosnian Serb nationalist group seeking to unite territories containing ethnic Serbs under Serbia's control.
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A month after Archduke Franz Ferdinand is assassinated Austria Hungary declares war on Serbia Hungary and this is the how WW1 started.
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Serbia and Austria Hungary are at war and they both need help so they call for support and many Allied powers get involved and many Central powers get involved.
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Allied forces stop the German forces from advancing into France during the first battle at Marne.
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German submarines sinking the Lusitania on its trip from New York to England and 128 Americans died.
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This was the start of the Alpine front that was 600 kilometers long most of it being mountains along Italy boarder.
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Germany starts the battle of Verdun that is a major war in WW1.
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The British and French forces come together to Defeat the German forces on the western front.
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After a long couple of months the Allied forces came out on top and won the Battle of Somme on the western front.
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The Battle of Verdun ends with many causalities including 550,000 French deaths and 450,000 German deaths.
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After many issues with Germany the United States decides to join WW1 on the Allied Side and first declare war on Germany.
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The first United States Independent operation of the war to take Cantigny.
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United States forces win the Battle of Cantigny and take Cantigny.
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After many long years of fighting the Italian troops win and defeat the Austria Hungary troops on the Alpine front.
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WW1 Allied and German representatives sign the Treaty of Versailles and this is technically the official end to WW1.