Discussed in this essay:
The Internationalists: How a Radical Plan to Outlaw War Remade the World, by Oona A. Hathaway and Scott J. Shapiro. Simon & Schuster. 608 pages. $30.
How to Do Things with International Law, by Ian Hurd. Princeton University Press. 200 pages. $29.95.
A Foreign Policy for the Left, by Michael Walzer. Yale University Press. 216 pages. $30.
In 416 bc, midway through the Peloponnesian War, a powerful force landed on the island of Mílos. Though technically a Spartan colony, Mílos had stayed out of the decades-long war between Athens and Sparta.…