History at its most fundamental level is the study of causes. The reason ‘History’ as a subject is so exciting is that it is not really about what happened, rather why it happened, how it happened and sometimes even if it happened.
Contrary to popular belief, history as we know it is far from static. The causes of the Russian Revolution, the significance of Napoleon, even Hitler’s responsibility for the Holocaust are issues being debated even now. Just as a general consensus is reached, a historian will publish a new view that turns the field on its head.
If History is the study of causes, then a fairly strong case can be made for the claim that a 19-year-old Bosnian serf was the most important individual in the 20th Century. If that doesn’t make you want to study History, I don’t know what will.