What are the causes of World War One?

Let's split them into long term, short term and the trigger cause:Long Term:Imperialism - Colonies and Colonial expansionNationalism - especially in central EuropeShort Term:Militarism - building up of armies, dreadnoughtsAlliances - Triple Entente vs Triple AllianceTrigger:Assassination - Archduke Franz Ferdinand and his wife in SerbiaRemember - MAIN A