It prompted European nations to break all ties with one another describes the effect of militarism in the years leading up to World War I Countries built large armies and stockpiled powerful weapons.
Nationalists in Serbia along side allied Russia (because they were each Slavic people) desired Serbia to split from Austria and create a big 'Serbian kingdom'. This caused the assassination of Arch-Duke, Franz Ferdinand and the eventual battle.
Nationalism became a particularly important purpose of worldwide conflict I because of several key elements. for example, it induced countries to accumulate their armies and brought about expanded militarism. As well, it created extraordinarily high tensions in Europe for the long time before the outbreak of the first international conflict.
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