How has war shaped us? In conversation with Margaret Macmillan

War seems to be omnipresent in human history and despite the number of people who have argued that the world is getting ever more peaceful, it remains a reality for millions of people today. Margaret MacMillan is Emeritus Professor of International History at the University of Oxford and a world–renowned expert on history and international relations. Nick Spencer speaks to her about her book 'War: How conflict shaped us' which looks at how humans have fought and made peace with one another for millennia, and explores what this says about who we are.