The main cause was the assassination of Franz Ferdinand who was the archduke of Austria. He was assassinated by Gavriollo Princip who was Austrian - Hungarian. Those two countries were constantly in conflict because Hungary wanted to separate and once those countries went into war over the assassination their allies had to join being the rest of Europe. <span />
It really depends on which war the question is referring to, but if it's referring to WWII the answer would be true.
No traffic!!! cmon man you should know this
