ROBERT J. LIEBER is professor of government and international affairs at Georgetown University. His most recent book is The American Era: Power and Strategy for the 21st Century.
Jackson Diehl on sectarianism in Syria, Elliott Abrams and Robert Wexler on Iran's nuclear threat, and John Rosenthal on Germany and the origins of the euro crisis. Plus US-Pakistan relations, academia's new communism, Spain's economy, and more...