I believe that there most important event in European History from the years between 1900-1940 would have to be World War 1. World War 1 was known by other names such as ‘The War to End All Wars’, ‘The War of the Nations’, ‘WWI’, and ‘The Great War’. World War 1 changed the way countries negotiated with each other and paved the road for the World War 2. It implemented new ways for wars to be fought, by testing out the machine gun, air combat, and chemical warfare for the first time in any war. It all started on June, 18 1914 with the assassination of Archduke Franz Ferdinand. This wasn’t the only cause, just the primary one. There was also a difference over foreign policy between the major world powers. Some of the countries were even hoping