Faught for something they believed in
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It's 2017 now so it was 2517 years ago to 500bc and 1517 to 500AdD
So that your teacher will understand you
The direct cause of WWI was the assassination of Archduke Franz Ferdinand at Sarajevo on 28 June 1914. However historians feel that a number of factors contributed to the rivalry between the Great powers that allowed war on such a wide-scale to break out. I'm not sure who the assassin was.
