When Manuel Zelaya was deposed as president of Honduras with the support of the Supreme Court, the National Congress, the attorney general and most of his own party, much of Latin America went into conniptions about safeguarding the constitution. Of course, that was precisely the issue. Zelaya was about to traduce the constitution, which forbade extension of the chief executive's term, precisely his intention. This is common in the lower part of the Western Hemisphere, and it is the opus operandi of Hugo Chavez in Venezuela.

Saviors and Survivors: Darfur, Politics, and the War on Terror

By Mahmood Mamdani

(Pantheon, 398 pp., $26.95)

The Responsibility to Protect: Ending Mass Atrocity Crimes Once and For All

By Gareth Evans

(Brookings, 349 pp., $24.95)

I.

In the summer of 2007 , Mahmood Mamdani found himself at a meeting of activists and politicians, listening to sentiments that had by then become quite common among a certain class of politically active Americans. The speakers were calling on the United Nations to send peacekeepers to Darfur. Fed up with the inability of African Union troops--who were already on the ground in western Sudan--to stop the ongoing bloodshed, they insisted that U.N. forces could do better. The United Nations, explained one politician, echoing a view you could have heard on any number of college campuses at the time, would grant "mercy" to the people of Darfur.