Seemingly recent increases in military interventions into states that are embroiled in civil conflicts (Iraq, Yemen, Syria, Afghanistan, etc.) leads to questions of why these actions are unfolding, despite traditional calls for nonintervention. This book statistically tests numerous independent variables on the occurrence of intervention at the cross-national level. In particular, this book focuses three chapters on the hegemonic abilities of the United States as it intervened (or did not) in cases across the Middle East in the Cold War and post-Cold War eras. The U.S. reaction to the crises in Lebanon, Algeria and Libya provide interesting examples for comparison to the cross-national results and complete a mixed methods approach to understanding the causes of third party military interventions in intrastate conflicts.