This book discusses, through two demographic case studies, the post-war migration of labour and its dependents to Western Europe, and the resulting development of ethnic minority populations within the European countries. The study of Britain traces the demographic development of the "black" population back to migration patterns as determined by economic and political factors. In the West German study, the different migration experiences and development patterns of six minority populations are examined, and it is concluded that these populations are permanent rather than temporary as their legal status suggests. The two case studies are examples of the same migration process which begins with migration and continues through the demographically irregular development of the minority population until past migration patterns no longer have a significant demographic effect.