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Austria-Hungary's Archduke, Francis Ferdinand assassinated while visiting Bosnia
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Austria Hungary declares war on Serbia due to the assassination of their archdukde, Francis Ferdinand
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Great Britain declares war on Germany for violation of Belgium's nuetrality.
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A German U-boat attacks passenger ship with U.S, passengers aboard, helping lead U.S. into the war
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Italy betrays Triple Alliance by attacking Austria Hungary
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Czar Nicholas steps down due to pressure from the duma
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U.S. joins war due to continued restricted submarine warfare
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Armistice signed by Germany to end fighting
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Also creating the League of Nations