Why Did One Cause World War One?

World War One Imperialism, nationalism, militarism, alliances, and the assassination in a way sort of all cause World War One. But the real question is which one caused the World War One more? We can definitely cross out imperialism and nationalism from being the most impacted on the World War One. Therefore that only leaves the other three that the most impact on World War One. Nationalism means being a supporter of a country’s rules and interest. Nationalism led the European nations to compete for the largest army and navy, or the greatest industrial development. Nationalism also gave the groups the idea of forming independent nations on their own. Nationalism poses a problem for Austria-Hungary and the Balkans, areas comprised of many conflicting national groups. In 1908 Austria-Hungary annexation of the former Turkish Province, which then angered Serbians because they felt that the province should have been theirs. Serbia threatened war on Austria-Hungary and Russia had pledged their support towards Serbia. Which then cause Germany to ally with Austria-Hungary and threaten a war towards Russia, although Russia back downed so therefore the beginning of World War One was postponed. So
The menace of the hostile division led to an arms race, another cause of World War One. Germany was the leader in a military organization and efficiency, the great powers of Europe copied the universal conscription and detailed planning of the Prussian System. The armies of France and Germany doubled in size between 1870 and 1914. Naval expansion was also competitive, particularly between Germany and Great Britain. British had established the principle that maintained naval superiority in the event of the