As president, Teddy Roosevelt was not the Bull Moose of his earlier years. His prudence and respect for the balance of power are a model for any future president.
As the "unipolar moment" stretches out into an era, its opportunities and vulnerabilities both come clearer a dozen years after its conceptual coinage.
The maritime services are under growing strain. But is there really no alternative to U.S. sea hegemony in the same form we have seen it in since 1945?