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Verified Answer :

  1. NAtionalist tensions in Europe 
    2. Competition for European colonies 
    3 Arms races and militarianism 
    4. Formations of defense alliances 

    Immediate Causes (just in case you need to know): 
    1. Assassination of Franz Ferdinand 
    2. Austria-Hungary's retaliation against Serbia 
    3. Declarations of war between rival alliances. 
    4. Germany's invasion of Belgium.