Lebanon and Israel/Palestine are two political entities that expanded in 1920 and 1967 respectively, and became divided societies characterized by periods of stability and conflict. This book provides the first detailed comparison between the two states and also explores the effects of their expansion on their changing relations. It looks first at how both expanded states attempted to cope with their predicaments, focusing on the relationship between state, community and security, before moving on to analyze the de-stabilizing effects of expansion on Israeli-Lebanese relations. The book draws on previously unpublished official documents, memoirs, media resources and films produced in Lebanon and Israel/Palestine, in addition to existing works on the two states and the Middle East. Bridging the gap between comparative politics and international relations, it will interest students of Lebanon and Israel/Palestine, the Middle East, and conflict and peace.