A cause of World War One is Alliances. Alliances were another cause of war because it caused many countries to enter into the conflict. As the alliances joined and then their alliances joined the war grew and grew and eventually the whole world was involved. The main allies were the Triple Entente and the Triple Alliance. The Triple Entente consisted of Britain, France and Russia. Germany, Austria-Hungary and Italy were all apart of the Triple Alliance.
Another cause of this war was lack of international organization. At that time there was no United Nations to instill rules and regulations for international affairs. There was only The Hague Court Of Arbitration. And they only assisted in individual treaties, that were created between two nations These treaties were sometimes contradicted with treaties of other nations.