What were two reasons for World War 1?

All the prospering (and not very prospering)countries wanted to build empires because colonies provided extraprofit and of course every nation wanted a portion of it. That is the basis of imperialism. Alot of countries were ready or started to get ready for a war or to defend themselves in case of an attack=militarism. Nationalism was another reason - people started to feel strong feeelings towards their countries and were prepared to defend them. The main reason why the war became a world war was that long before 1914, the prominent countries started to make alliances. They promised help to each other which meant that if a country was attacked by a common enemy the ally would run and intervene in the conflict and help the attacked.