The real question about America’s role in the world today, is not whether America itself is declining, but whether the international order it built and dominated thus far, which some call the liberal international order or the American world order, will be enduring. The two issues are often conflated but, in fact, are different. Whether America is declining is debatable; the fate of the American world order is less so.
http://nationalinterest.org/feature/american-primacy-multiplex-world-17841