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Archduke Francis Ferdinand was assassinated by a Serbian terrorist.

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Austria declared war on Serbia after they declined the ultimatum Austria offered.

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Germany's goal was to encircle and crush France’s army.The Germans embarked on the plan by invading Belgium on this day.

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Britain and other European powers had signed a treaty guaranteeing Belgian neutrality. Outraged by the invasion of Belgium, Britain declared war on Germany

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Italy and Britain still remained uncommitted. Italy chose to stay neutral for the time being.