Chapter 1: The Treaty of Versailles and the League of Nations (Lesson 1 of 3) In this lesson, we got started on the History syllabus by learning about the events leading up to WWI. We were hit with a barrage of '-isms': Militarism, Imperialism and Nationalism. We then found out how these '-isms' contributed to the outbreak of WWI. Please note that this topic is *not tested* in the O Levels.