The Future of Power by Joseph Nye Jr

On trends in modern international relations:
"In the 21st century, a smart foreign policy will combine the hard power of coercion and payment with the soft power of attraction and persuasion. It's no longer adequate to define a "great power" as a country able to prevail in war (in the words of the historian A.J.P. Taylor). Success depends not only on whose army wins but also on whose story wins. American political leaders and many scholars have not yet adjusted to this new reality. It is time that they do"