Variations in domestic contention on foreign policy, particularly variations of a cyclical nature within the United States, have been often identified but not explained. Changes in international interactions on global issues affect domestic contention. Such external events as the rise of new global issues, the emergence of crises, moves toward accommodation and resolution, war, and foreign-policy failure are related to the diverse forms that domestic contention can take. U.S. domestic contention, both in the recent past and in the short-term future, illustrates particularly well how hard-liners and accommodationists battle over the lessons of history.