In asymmetric interstate conflicts, great powers have the capability to coerce weak states by threatening their survival-but not vice versa. It is therefore the great power that decides whether to escalate a conflict into a crisis by adopting a coercive strategy. In practice, however, the coercive strategies of the U.S. have frequently failed. In Coercion, Survival and War Phil Haun chronicles 30 asymmetric interstate crises involving the US from 1918 to 2003. The U.S. chose coercive strategies in 23 of these cases, but coercion failed half of the time: most often because the more...