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Committed to germany and austria-hungary in a defensive war. they did not view germany's acts as defensive so the switched sides.
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Archduke Franz Ferdinand and his wife Sophie were assassinated by the Black Hand, specifically Gavrilo Princip, in Sarajevo, Bosnia-Herzegovina
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Tsar Nicholas II ordered the mobilization of Russian forces to deter Austria-Hungary from invading Serbia.
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Germany mobilized their troops in response to the mobilization of the russian troops
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bound by a treaty to russia
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Linked to France by a relatively loose treaty
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Had a military agreement with britain that it honored.
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The Battle of Verdun was fought from 21 February to 18 December 1916 on the Western Front in France. The battle was the longest of the First World War and took place on the hills north of Verdun-sur-Meuse.
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India, austrian canada, NZ, SA offered military support for britain
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The sinking of the lusitania and the zimmerman note forced their hand to enter the war