There were acctually 4 causes of tension for Europe in 1914. :
Nationalism, Imperialism, Militarism, and Alliances.
Before World War I, three key causes of tension in Europe included militarism, nationalism, and the complex system of alliances. Militarism led countries to build up their armed forces and foster a culture that glorified military power. Nationalism fueled rivalries as ethnic groups sought independence or dominance, particularly in the Balkans. Additionally, the intricate alliances, such as the Triple Alliance and the Triple Entente, created a scenario where a conflict involving one nation could quickly escalate into a larger war.
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
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
the allies thought if they didnt stop the axis in Europe that they could take over the world