There were acctually 4 causes of tension for Europe in 1914. :
Nationalism, Imperialism, Militarism, and Alliances.
One of the main causes of the extent of World War I was the alliances in Europe at the time, which brought many nations who had no stake in the original conflict into the war. Another cause of World War I was imperialism, which caused tension between European nations who were fighting over land to colonize.
Cold War.
But Eastern Europe was prior to World War 1. There was a lot of tension between and among the countries and the first spark (the assassination of Ferdinand) set off the explosion.
it caused Serbia to declare war on Austria Hungary
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Ralph W. Greenlaw has written: 'World of Europe, Since 1715 (World of Europe Since 1715)' 'The economic origins of the French revolution' -- subject(s): Causes, Causes and character, Economic conditions, History
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Secret alliances
they were the killing of the archduke and the archduchess and to conquer Europe 4
they were the killing of the archduke and the archduchess and to conquer Europe 4
Factors leading to the growing tension in Europe included the Nazi-Soviet Non-Aggression Pact, the policy of appeasement, and the failures of the League of Nations. Last, but not least, were the dictatorships of Hitler in Germany and Mussolini in Italy.
In 1914 tension was building soo much. Europe had split pretty much in two, and these groups began to clash in many parts of the world. Whenever they did Europe always looked on the point of war. But it was the assasination of Franz Ferdinand that finally pulled Europe into war.