Human displacement has always been a consequence of war, written into the myths and histories of centuries of warfare. However, the global conflicts of the twentieth century brought displacement to civilizations on an unprecedented scale, as the two World Wars shifted participants around the globe. Although driven by political disputes between European powers, the consequences of Empire ensured that Europe could not contain them. Soldiers traversed continents, and civilians often followed them, or found themselves living in territories ruled by unexpected invaders. Both wars saw fighting...