I’ve heard the author on some talk shows. His premise is that after dominating world affiars in the last century American power and influence will diminish and that of other countries will grow. America will still be a major power, but one of several, no longer the lone superpower. The title is supposed to mean it will no longer be an “American world”, not that America won’t exist. Asked if he thought the title was misleading, the author said the publisher wanted it to be controversial to sell more books.