Midway through the eighteenth century, the rate of growth for the world's population was roughly at zero. Immediately after World War II, it was just above 2 percent. Ever since, it has fallen steadily. This new book, the latest offering from a distinguished expert on international economics, tells readers what this stagnation or fall in population will mean - economically, politically, and historically - for the nations of the world. This study asserts that the United States is not the "last remaining superpower" but the "critical margin" without whose support no constructive action on the world scene can succeed. Rostow takes the view that world peace will depend on our government's ability to assume responsibly this "critical margin" role.