In your opinion, what was the most important underlying cause of world war i?

In my opinion the most important cause for the World War I was the imperialism view of several countries at that time.  

Explanation:

Imperialism, Imperialism is the sought of conquering different territories and make them live under the rule of an Imperialist country. This view is also a long-term cause and depicts how in a given point a country's eagerness for domain other nations will result in a military conflict.

In World War I the Germans have a strong Imperialism view of the world as well as French, England, and Russians.

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explanation:

7 - to develop an asian ally

11- the red scare

14   the power of military -industrial complex

17 - the economy grew quickly

24 - the separation of church and state was not important