What Was the Main Cause of World War One?

Instead of trying to point to one major cause for the First World War, like many historians attempt to argue, there were many causes that evolved around four major ones. Even Benthmann portrayed his frustration with attempting to isolate a major cause when his reply to the question of what started the war was "Oh, if only I knew". The four main causes were imperialism, militarism, alliances, and nationalism. Without these influences the war would have never happened. However, all four of these main causes were inspired and encouraged by nationalism.
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