The answer to a multiple choice question is "a lack of political alliances" because the exact OPPOSITE was the major contributing factor.
Too many treaties bound powerful nations to defend smaller allies, leading to the inclusion of most of Europe in the war, along with the Ottoman Empire and eventually the US. Of course, Germany used this only as a pretext to join Austria-Hungary and seek even greater expansion than they gained in the Franco-Prussian War (1870-71).
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Almost everything did not cause World War 1. You could list things like:
and so many other events that it is not worth trying to do so.
It can be anything which isn't an cause of WW2 in Europe. e.g. Invasion of USSR or Battle of Berlin wasn't an cause of WW2, It was an event in World War 2.
There was several factors that led to World War One. One of the major causes of the war was the assassination of Archduke Franz Ferdinand and his spouse.
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Many European countries started forming alliances that could easily cause problems if something happened. This something was the assanition of the Duke and Duchess of Austria-Hungrary by a Serbian assassin.
WWI was a major cause of the Great Depression.
Answer this question… different ethnic groups tried to claim the same lands as a national home