MOST WRITERS ARE AMBIVALENT ABOUT NOTES. THOSE LITTLE superscript numbers interrupt whatever rhetorical flow a writer can get going. They strike some people as a little pretentious and showoffy, and few readers pay much attention to them. On the other hand, a book such as this was informed by hundreds of sources, and the interested reader deserves to know which ones were the most influential. Some writers stand on the shoulders of giants. I make no such claim. Rather, I have hitchhiked on the backs of such original thinkers as de Tocqueville in the nineteenth century, Walter Lippmann in the twentieth, and Fareed Zakaria and Joseph Nye in the twenty-first. I’ve credited such sources in the text itself and cited the names of other people and organizations that provided the most insightful contributions. These endnotes expand on those references and also direct interested readers to specific bibliographic information. I’ve also tried to provide Web addresses for source material whenever possible. But, as most readers know, Internet links can be unreliable and out of date, so I’ve also indicated when I last accessed the site myself.