World War One was a war between the major powers of Europe that can not be said to have had one specific cause.
Tensions between the major powers and Germany, quickly advancing and becoming a larger power in Europe, were always on a knife edge.
Without armies it is hard to fight a war, also without armies the tension between countries may well have been much reduced.
Nationalism caused much unrest in places such as the Balkans and in Austria-Hungary.
Alliances and Ententes Were to Blame for the Outbreak of World War One (WWI) In August 1914, World War One broke out.
The main cause of the war has never been established and has been among the many debates among historians studying this period.In my opinion, Alliances Another reason for the creation of these alliances was the naval race between Great Britain and Germany.In order to keep the largest naval power; Britain, France and Russia formed an Allegiance, which increased the hostility between the rival nations, Britain and Germany.Three years later France had brought Britain and Russia together, and after signing the Anglo-Russian Entente the Triple Entente was formed.Thus, due to the tension between the Great Powers, the alliance system was a prominent cause of World War One.The trigger of the war, the shooting of the Archduke Franz Ferdinand could have been viewed as a direct result of nationalism.Nationalism was especially high in Austria-Hungary. Inside Austria-Hungary there were up to 11 different nationalities.All these nationalities had viewed Serbia gaining their independence and were starting to feel jealous.This caused many uprisings against the Dual Monarchy that ruled over Austria-Hungary.This greatly angered the French and huge tensions were felt between the countries.Nationalism also helped cause Russia to enter the war in defence of Serbia.