We studied World war I in Social class, and we talked about “The Diary of a Young girl” in literature class, it's the true dairy during the World War II. I learned historical events about WWI and WWII, know a lot of things that we don't know before. World war I was a global war mostly centered in Europe that began on 1914 and lasted until 1918. Cause of World war I which were political, territorial, and financial problem, Additional causes were militarism, a complex web of alliance, imperialism, nationalism. By the end of the war, four major imperial powers-the German, Russian, Austro-Hungarian and Ottoman empires—ceased to exist. We know those how the war happen and the process of those