The struggle against violent extremism is the most significant national-security challenge of the 21st century. It is the challenge that makes all the threats Americans face that much more dangerous. The ungoverned spaces, urban slums, and impoverished regions of the Middle East, Asia, and Africa, along with the poorly integrated immigrant…

The basic point which this discussion attempts to emphasize is that the political perception of urbanization in Tropical Africa tends to be dominated by concern with urban unemployment (and its social and political consequences) as the major, visible and explosive byproduct of the acceleration of rural-urban migration which has been one of the…