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
Europe Minor East
Europe Minor East