America owes its origins to Europe and is unthinkable without Europe, but there has always been a strand of American thinking which has downplayed the connection and wished to assert the exceptionalism of the American experience and the need for America to keep Europe at a distance to involve contamination from its old, corrupt power politics. Europeans were fascinated by the new world unfolding in America, which contrasted so sharply with their own, yet was so intimately related to it. At the same time they regarded America as for the most part a novice and outsider in world politics. Recently roles have been reversed, with many Europeans condemning America as a new Empire, while many Americans accuse Europe of refusing to share the burden...