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Assassination
Franz Ferdinand was assassinated. -
Austria-Hungary
Austria-Hungary joined the war. -
Serbia
Serbia joined the war. -
Great Britain
Great Britain joined the war. -
Belgium
Belgium joined the war. -
France
France joined the war. -
Russia
Russia joined the war -
Germany
Germany joined the war. -
Ottoman Empire
The Ottoman Empire joined the war. -
Italy
Italy joined the war. -
Bulgaria
Bulgaria joined the war. -
Portugal
Portugal joined the war. -
Romania
Romania joined the war. -
Greece
Greece joined the war.
