The buildup of Germany's standing army in 1913 and its development of weaponized submarines are two examples of the ARMS RACE that contributed to the start of World War I. Another contributing factor to the start of the war was the rise of NATIONALISM as evidenced by the assassination of the Archduke Ferdinand of Austria by a Bosnian Serb.
The direct cause of the war was the murder of Franz Ferdinand and his wife. However, the real causes lay deeper. Some historians blame the increasing popularity of militarism and radical nationalism in Europe. These movements accused their governments of inaction in the face of external threats and thus stimulated the arms race in 1912 and 1913. Other analyzes blame imperialism, economic problems and the restless territorial expansion of the great powers.
The long-running cause of the war was the imperialist foreign policy of most European nations, including the British Empire, France, the German Empire, the Austro-Hungarian Empire, the Ottoman Empire, the Russian Empire, Italy and Serbia. The mutual tension and competition had been slowly rising to the boiling point for decades and it was finally a matter of waiting for a direct confrontation between the superpowers.
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