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Murder of Archduke and his wife ignited a conflict between the Austro-Hungarian Empire and Serbia.
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Kaiser Wilhelm II, Germany, backs the Austro-Hungarian Empire in case of retaliation from Russia, France, and possibly Great Britain.
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The Austro-Hungarian Empire declares war on Serbia. Serbia asks for Russia's backing. Within a week, Russia, France, Great Britain, Russia, Germany, and the Austro-Hungarian Empire were all at war.
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After the declaration of war on Serbia by the Austro-Hungarian Empire, Serbia asked for the Backing of Russia and they got it. Russia brings its allies into the war to end it as quick as possible.
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To invade France, the German military marched through neutral Belgium, leaving death in their wake.
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Based off the invasion of a neutral country, Britain declares war on the German forces.
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Even though many Americans were apposed to joining the war, the U.S. joined its allies Britain, France, and Russia in the war.