Lyndon Johnson invaded the Dominican Republic. Richard Nixon sponsored a coup attempt in Chile. Ronald Reagan waged covert warfare in Nicaragua. Nearly a dozen times during the Cold War, American presidents turned their attention from standoffs with the Soviet Union to intervene in Latin American affairs. In each instance, it was declared that the security of the United States was at stake--but, as Michael Grow demonstrates, these actions had more to do with flexing presidential muscle than responding to imminent danger.

From Eisenhower's toppling of Arbenz in Guatemala in 1954 to Bush's...