Answer:Alliances- Countries felt loyal to one another so if one was in trouble then the others would come and help out.
Nationalism- To prove that their country is the best.
Imperialism- many European countries sought more expansion
Military- Strong military force.
WWl could have been prevented since the German support from Austria-Hungary. The "triple alliance" of Germany, the Austro-Hungarian Empire, and Italy was predicated on mutual defense, not on mutual aggression - this is what allowed Italy to abstain from the early phases of the war and eventually to join the Entente Powers.
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