Peace requires no nation to be second to any other but only to the world"" argues Mr. Adler in this revolutionary challenge to our thinking about war and peace. We must achieve, he says, not a society of nations, but a society of men; he concedes that it may take 500 years to achieve the goal of permanent peace, and even that only by educating our thinking now so as to establish the longest possible truce and make tangible progress towards lasting peace. Sovereignty and internationalism must successively give way to world government; this means a radical transformation in nations and in men. Moral obstacles present more of a hurdle than geography or economics or politics; physics must yield to psychology; technology to liberal education. He enforces his argument with historical analogies; -- We have progressed from the family unit to a conception of regional federation; regional federation on a broader scale than any yet suggested must form the interim step to the ultimate goal of ""one world"".