The questions examined by the authors are what happens to human mobility in a globalising world? How does globalisation impact on people in different regions of the world? How do people react to the differential developmental impact of globalisation? Is there a case of circular and cumulative causation which results in developed regions becoming more developed, and less developed regions losing out, even given the little development they have achieved? The first and second parts examine the long history of international migration in Nigeria, from the trans-Saharan trade and trans-Atlantic slave trade, to the later migrations to other parts of West Africa, the rest of Africa, and Europe and North America. The third part examines how migration is being managed in Nigeria and in the host countries; the fourth part considers the developmental implications.