Beginning with a survey of geopolitics and its practitioners, Saul Cohen explains geopolitical terms, structure, and theory. He traces the geopolitical restructuring of the world's different regions, its major powers, and the global networks that link them, thus creating a map of dynamic equilibrium. Cohen illustrates why those regions, the convergence of what he terms the Maritime. Heartlandic Russian, and East Asian realms have become ''Gateways,'' while the Middle East remains a ''Shatterbelt'' and much of South America and Sub-Saharan Africa have grown marginalized.