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the heir to the Austrian throne, Archduke Francis Ferdinand was assassinatednby a Serbian in the Bosnian city of Sarajevo.
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The assasination of Francis Ferdinad caused a between Austria and Serbia, so Austria had an ultimatum to Serbia in July 23 1914.
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one month after Archduke Franz Ferdinand where killed Austria declared war on Serbia,that was the beginning of World War I
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Russia movilized to support Serbia.
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Germany gave Russia an ultimatum that threatened mobilization if Russia did not rescind its mobilization orders within 12 hours
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Germany declared war on Russia on August 1 1914 because Russia didn’t respond.
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Germany declared war on France because it was supported by Russia.
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On August 4 1914 German troops invaded Belgium because it was supported by France.
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Great Britain declared war on Germany because it was supporting Belgium.
