WWI major cause was Archduke Franz and his wife being assassinated by Gavrilo Principethnic Serb, nationalist from Young Bosnia group, also known as the July Crisis of 1914. Gavrilo tried to break off Austria-Hungary.
Underlining Causes
Militarism
Imperialism
Nationalism
Economic Competition
System of Alliances
Allies
France
British
Russia
Italy-Betrayed Alliance
United States
Japan
Serbia
Montenegro
Opposing(central powers)
Germany
Austria-Hungary
Ottoman Empire
Bulgaria-Turkey
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