However, despite the guerrillas' unpredictable and sporadic attacks against targets all over the countryside of the Portuguese African territories, the economies of both Portuguese Angola and Mozambique were booming, cities and towns were expanding and prospering steadily over time, new transportation networks were being opened to link the well-developed and highly urbanized coastal strip with the more remote inland regions, and the number of ethnic European Portuguese migrants from mainland Portugal (the "metrópole") increased rapidly since the 1950s (although always as a small minority of each territory's total population).