"Speak softly and carry a big stick" Theodore Roosevelt famously said in 1901, when the United States was emerging as a great power. It was the right sentiment, perhaps, in an age of imperial rivalry but today many Americans doubt the utility of their global military presence, thinking it outdated, unnecessary or even dangerous.
In The Big Stick, Eliot A. Cohen-a scholar and practitioner of international relations-disagrees. He argues that...