In the first half of the twentieth century millions of Europeans were displaced by war, genocide, the redrawing of international borders, and mass flight from countries ruled by autocratic regimes. In order to address the need for a more integrated analysis of their experiences, our edited volume A Transnational History of Forced Migrants in Europe. Unwilling Nomads in the Age of the Two World Wars looks at the collective experience of different refugee groups through the lens of a four-dimensional model of ‘host society’, ‘homeland’, ‘diaspora’ and ‘other diasporas’.