Answer:
The war started mainly because of four aspects: Militarism, Alliances, Imperialism and Nationalism. This is because big armies become potential threats to other countries, other countries started forcing alliances in order to secure land. The overall cause of World War was the assassination of Archduke Franz Ferdinand.Militarism denoted a rise in military expenditure, an increase in military and naval forces, more influence of the military men upon the policies of the civilian government, and a preference for force as a solution to problems. Militarism was one of the main causes of the First World War. These groups hoped to drive Austria-Hungary from the Balkans and establish a 'Greater Serbia', a unified state for all Slavic people. It was this pan-Slavic nationalism that inspired the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914, an event that led directly to the outbreak of World War I.
The clearest and most direct example of militarism in world war 1 is the Kingdom of Romania having an army of 500,000 soldiers. So an kingdom of that size created a 500,000 man army for no actual gain.
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