El Niño is an extreme climate perturbation that periodically changes weather throughout the globe, often with dire consequences. First recognized in Peru, El Niño events are best known and documented there. This book summarizes research on the nature of El Niño events in the Americas and details specific historic and prehistoric patterns in Peru and elsewhere. By also looking at other catastrophic natural events in the ancient New World, the book illustrates how scientific archaeology can serve pure research as well as provide information for contemporary issues.