Historically, nationalism and imperialism are evil twins. They depend on each other and hate each other. They shaped 20th century European and global development; and their study has lessons to offer for the 21st. Self-determination and Sovereignty emerge as key terms. It turns out that self-determining nations are anything but sovereign and they tend to respond to this condition with their hearts more than with their minds. In extreme cases, they panic and choose catastrophe over (inter-)dependence. University of Chicago historian and IWM Visiting Fellow Michael Geyer, one of the world’s leading military historians, is joined in conversation by IWM Permanent Fellow Ayşe Çağlar.