How were economic cometition and imperialism cause of world war 1?

Imperialism was a large cause because of the Austro-Hungarian Empire having Serbia in their empire. Serbian rebels killed an Archduke of the Empire sparking a war. Economy was also a large part because many nations wanted to cripple opposing nations economies so that their own could boom.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).