Causes Of World War 1 This essay is talking about the causes of the First World War or as it's now said World War 1. This war was fought in two different places first and was the main place is Europe and the second place was Africa. Ten countries fought in this war such as Greece, Portugal, Italy, Germany, Britain, France, Serbia, Belgium, Russia, and Romania. Many causes led to the First World War. I'll start from the beginning which is the war between Prussia and France, also the unifications of countries. In the eighteenth century, the two unifications that happened were the: German and Italian unification, the last topic is the arms race.