America's foremost authority on geo-politics studies our power position in World War II, and the steps by which we reached it. He concludes that the ""interest of the H. S. demands not only victory in the war, but also continued participation in the peace"" -- the end of isolationism for all time, the approach to international life through functional means. He reaches his conclusions after long and scholarly weighing of the nature of Power, of the place of the U. S. in the western hemisphere, in the transatlantic and transpacific zones, in the world. He proves that all great coastal regions are inevitably interdependent economically and politically. He proves conclusively that the struggle for Latin America is an economic one, rather than ideological or political, and that hemisphere defense against victorious Axis powers is impossible; we should have to retire into quarter-sphere defense. Hence his conclusion. A book for thoughtful readers.