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Austria-Hungary and Serbia battle over Bosnia which causes tensions to be high.
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France was given Morocco from Britain but Morocco wanted to be free and was backed by the Germans.
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There were no international laws that disallowed countries from using violence against one another.
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Many countries had mutual defense alliances, so if one country went to war, it caused other countries to get involved. This made any battles bigger than should have been.
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Archduke and his wife were assassinated by a Serbian in Sarajevo.
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Austria-Hungary attacks Serbia.
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Russia orders a partial mobilization against Austria-Hungary for their invasion of Serbia.
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