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Archduke Franz Ferdinand killed
Political instability in the Balkans threatened to destroy some agreements they had with the Ottoman power and Russia.
https://www.history.com/topics/world-war-i/world-war-i-history -
Germany declares war
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Battle of the Marne begins
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Britain and France declare war on Ottoman Empire
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Battle of Ypres begins
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Lusitania is torpedoed by Germans
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Battle of Verdun begins
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Battle of Somme begins
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Tsar Nicholas II take the thrown in Russia
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U.S declares war on Germany
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Maria Bochkareva forms the Women's Battalion
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Greece declares war on the Central Power
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British attack on Messines
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Sir Frederick Maude dies in Mesopotamia
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Mass tank attack on Cambrai
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German U-boats hit U.S water
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Treaty of Versailles signed
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Battle of Le Hamel
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Tsar Nicholas and his family murdered by the Bolsheviks
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Battle of Amiens begins